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1
Ferchaud, Fabien, Céline Peyrard, Joël Léonard, Eric Gréhan, and Bruno Mary. "Large Variations in N2O Fluxes from Bioenergy Crops According to Management Practices and Crop Type." Atmosphere 11, no. 6 (June 26, 2020): 675. http://dx.doi.org/10.3390/atmos11060675.
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Field N2O emissions are a key point in the evaluation of the greenhouse gas benefits of bioenergy crops. The aim of this study was to investigate N2O fluxes from perennial (miscanthus and switchgrass), semi-perennial (fescue and alfalfa) and annual (sorghum and triticale) bioenergy crops and to analyze the effect of the management of perennials (nitrogen fertilization and/or harvest date). Daily N2O emissions were measured quasi-continuously during at least two years in a long-term experiment, using automated chambers, with 2–5 treatments monitored simultaneously. Cumulative N2O emissions from perennials were strongly affected by management practices: fertilized miscanthus harvested early and unfertilized miscanthus harvested late had systematically much lower emissions than fertilized miscanthus harvested late (50, 160 and 1470 g N2O-N ha−1 year−1, respectively). Fertilized perennials often had similar or higher cumulative emissions than semi-perennial or annual crops. Fluxes from perennial and semi-perennial crops were characterized by long periods with low emissions interspersed with short periods with high emissions. Temperature, water-filled pore space and soil nitrates affected daily emissions but their influence varied between crop types. This study shows the complex interaction between crop type, crop management and climate, which results in large variations in N2O fluxes for a given site.
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Franklin, Bradley, Keith C. Knapp, and Kurt A. Schwabe. "A Dynamic Regional Model of Irrigated Perennial Crop Production." Water Economics and Policy 03, no. 01 (January 2017): 1650036. http://dx.doi.org/10.1142/s2382624x16500363.
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Economic analyses of regional irrigated agricultural production typically make little distinction between perennial and annual crops despite the distinctive characteristics of perennials. Such factors include high planting costs, lags in production, long lifespan, and potentially long-lasting impacts of input use and weather shocks. This study establishes a fully dynamic model of irrigated perennial crop production in a regional context where annuals are also grown. Perennial crop area is modeled as a vintage capital stock with age-dependent yields. The model is applied to the Riverland region of South Australia to examine the possible effects of both temporary and permanent changes in water supplies and the establishment of water prices, which is then used to estimate agricultural water demand. The model demonstrates that annuals are fallowed during drought so that perennial crops may be preserved and how, due to the fixed costs of re-planting perennials, annual crops are used to smooth profits while recovering from a severe shock. In all scenarios, a very slow rate of convergence to the steady state is found, highlighting the need for models that capture the transitional dynamics of agricultural land use in areas with significant perennial production.
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SNAPP, SIEGLINDE, PAUL ROGÉ, PATRICK OKORI, REGIS CHIKOWO, BRAD PETER, and JOSEPH MESSINA. "PERENNIAL GRAINS FOR AFRICA: POSSIBILITY OR PIPEDREAM?" Experimental Agriculture 55, no. 2 (April 12, 2018): 251–72. http://dx.doi.org/10.1017/s0014479718000066.
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SUMMARYPerennial grain crops have been proposed as a transformative approach to agriculture. Replacing annual staple crops with perennialized growth types of the same crops could provide environmental services, improve labour efficiency and weather resilience, reduce seed costs and produce livestock fodder or fuelwood production. Yet, the technologies and science for agricultural development in Africa have focused almost exclusively on annuals. In this paper, we review the literature to explore what has been potentially overlooked, including missed opportunities as well as the disadvantages associated with perennial grains. The case studies of pigeon pea and sorghum are considered, as an analogue for perennial grain crops in Africa. We find that a substantial number of farmers persist in ‘perennializing’ pigeon pea systems through ratoon management, and that sorghum ratoons are widely practiced in some regions. In contrast, many crop scientists are not interested in perennial traits or ratoon management, citing the potential of perennials to harbour disease, and modest yield potential. Indeed, an overriding prioritization of high grain yield response to fertilizer, and not including accessory products such as fodder or soil fertility, has led to multipurpose, perennial life forms being overlooked. Agronomists are encouraged to consider a wide range of indicators of performance for a sustainable approach to agriculture, one that includes management for diversity in crop growth habits.
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Unkovich, Murray, Kerrin Blott, Alex Knight, Ivan Mock, Abdur Rab, and Michael Portelli. "Water use, competition, and crop production in low rainfall, alley farming systems of south-eastern Australia." Australian Journal of Agricultural Research 54, no. 8 (2003): 751. http://dx.doi.org/10.1071/ar03049.
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Annual crops were grown in alleys between belts of perennial shrubs or trees over 3–4 years at 3 sites across low rainfall (<450 mm) south-eastern Australia. At the two lower rainfall sites (Pallamana and Walpeup), crop grain yields within 2–5 m of shrub belts declined significantly with time, with a reduction equivalent to 45% over 9 m in the final year of cropping. At the third, wetter site (Bridgewater), the reduction in crop grain yields adjacent to tree belts was not significant until the final year of the study (12% over 11 m) when the tree growth rates had increased. The reductions in crop yield were associated with increased competition for water between the shrub or tree belts and the crops once the soil profile immediately below the perennials had dried. At all 3 sites during the establishment year, estimates of water use under the woody perennials were less than under annual crops, but after this, trends in estimates of water use of alley farming systems varied between sites. At Pallamana the perennial shrubs used a large amount of stored soil water in the second summer after establishment, and subsequently were predominantly dependent on rainfall plus what they could scavenge from beneath the adjacent crop. After the establishment year at the Walpeup site, water use under the perennial shrubs was initially 67 mm greater than under the annual crop, declining to be only 24 mm greater in the final year. Under the trees at Bridgewater, water use consistently increased to be 243 mm greater than under the adjacent annual crop by the final year. Although the shrub belts used more water than adjacent crop systems at Walpeup and Pallamana, this was mostly due to the use of stored soil water, and since the belts occupied only 7–18% of the land area, increases in total water use of these alley farming systems compared with conventional crop monocultures were quite small, and in terms of the extent of recharge control this was less than the area of crop yield loss. At the wetter, Bridgewater site, alley farming appeared to be using an increasing amount of water compared with conventional annual cropping systems. Overall, the data support previous work that indicates that in lower rainfall environments (<350 mm), alley farming is likely to be dogged by competition for water between crops and perennials.
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Hung, Duong Manh, and Bui Trinh. "Perennial Plants in Vietnam's Economy." Research in World Economy 13, no. 1 (June 22, 2022): 19. http://dx.doi.org/10.5430/rwe.v13n1p19.
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Vietnam has strengths in perennial crop production due to its diverse soil, climate and crop ecosystems. Developing perennial crops is strength of our Vietnam's agriculture to serve the requirements of raw materials for the processing industry and for export. During the 36 years of renovation (1995 - 2021), perennial crop production has continuously developed comprehensively, growing rapidly both in terms of area expansion and intensive farming to increase productivity and output. In recent years, the output of most perennial crops has increased sharply, especially those associated with export such as coffee, rubber, tea, cashew, and pepper. Policymakers and many researchers in Vietnam seem to be "crazy" for the GDP index, so everything seems to be compared with GDP; if an industry's share in GDP is low, it doesn't seem these sectors important enough! This study used input-output analysis method to show the importance of perennial crops to the Vietnamese economy through the multiplier links between industries (inter-industrial) and the economy's supply-demand relationship.
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Franklin, Bradley, Kurt Schwabe, and Lucia Levers. "Perennial Crop Dynamics May Affect Long-Run Groundwater Levels." Land 10, no. 9 (September 15, 2021): 971. http://dx.doi.org/10.3390/land10090971.
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During California’s severe drought from 2011 to 2017, a significant shift in irrigated area from annual to perennial crops occurred. Due to the time requirements associated with bringing perennial crops to maturity, more perennial acreage likely increases the opportunity costs of fallowing, a common drought mitigation strategy. Increases in the costs of fallowing may put additional pressure on another common “go-to” drought mitigation strategy—groundwater pumping. Yet, overdrafted groundwater systems worldwide are increasingly becoming the norm. In response to depleting aquifers, as evidenced in California, sustainable groundwater management policies are being implemented. There has been little modeling of the potential effect of increased perennial crop production on groundwater use and the implications for public policy. A dynamic, integrated deterministic model of agricultural production in Kern County, CA, is developed here with both groundwater and perennial area by vintage treated as stock variables. Model scenarios investigate the impacts of surface water reductions and perennial prices on land and groundwater use. The results generally indicate that perennial production may lead to slower aquifer draw-down compared with deterministic models lacking perennial crop dynamics, highlighting the importance of accounting for the dynamic nature of perennial crops in understanding the co-evolution of agricultural and groundwater systems under climate change.
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Franco, José G., Marisol T. Berti, John H. Grabber, John R. Hendrickson, Christine C. Nieman, Priscila Pinto, David Van Tassel, and Valentín D. Picasso. "Ecological Intensification of Food Production by Integrating Forages." Agronomy 11, no. 12 (December 18, 2021): 2580. http://dx.doi.org/10.3390/agronomy11122580.
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Forage crops have the potential to serve multiple functions, providing an ecological framework to sustainably intensify food production, i.e., ecological intensification. We review three categories of forages (annual forages, perennial forages, and dual-use perennial crops/forages) we believe hold the greatest promise for ecologically intensifying food production. Annual cover crops can provide additional forage resources while mitigating nutrient losses from agricultural fields when they are intercropped with, interseeded into, or following an annual crop, for instance. The integration of perennial forages either temporally, such as annual crop rotations that include a perennial forage phase, or spatially, such as the intercropping of perennial forages with an annual cash crop, provide weed suppression, soil quality, and yield and crop quality benefits. Dual-use crops/forages can provide forage and a grain crop in a single year while providing multiple ecological and economic benefits. However, tradeoffs in balancing multiple functions and limitations in reducing the risks associated with these practices exist. Advancing our understanding of these systems so we can overcome some of the limitations will play a critical role in increasing food production while promoting positive environmental outcomes.
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O'Connell, Neil V., Craig E. Kallsen, Richard L. Snyder, Blake L. Sanden, Paul W. Giboney, and Mark W. Freeman. "(464) Temperature Relationships in a Mature Orange Orchard between Areas with or without a Partial Permanent Cover Crop." HortScience 40, no. 4 (July 2005): 1048B—1048. http://dx.doi.org/10.21273/hortsci.40.4.1048b.
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Many citrus growers are hesitant to plant cover crops, particularly perennial types, because of possible increased frost hazard. To quantify the increased risk, temperature relations over a 3-year period were compared between areas in a `Valencia' orange orchard with and without a partial perennial cover crop. The partial perennial cover crop consisted of a mowed perennial planting along the double drip line hoses, and an annually fall-replanted unirrigated strip of groundcover in the middle between the tree rows. This partial perennial cover crop increased the frost hazard compared to uncultivated bare ground even when wind machines were operating.
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Šroller, J., J. Pulkrábek, D. Novák, and O. Faměra. "The effect of perennial forage crop on grain yields in submontane regions." Plant, Soil and Environment 48, No. 4 (December 11, 2011): 154–58. http://dx.doi.org/10.17221/4214-pse.
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The structure of crop production (areas under crops, crop yields, fertilization) in 15 agricultural farms in potato-production and mountain regions of the Czech Republic was analyzed to evaluate the relations between NPK fertilization level, percentage of perennial forage crops on arable land and grain yields as the basic indicator of crop production output. A multifactor analysis based on simple regression equations indicated direct relations between the two above-mentioned factors and yield. Correlation and regression analyses demonstrated a close correlation between grain yields and percentage of perennial forage crops on arable land especially when lower nutrient rates in fertilizers were used (below 100 kg NPK.ha arable land). This relation was expressed for the whole set of initial data by the equation: Grain yield t.ha<sup>–1</sup> = log<sup>2</sup> (NPK rate in kg.ha<sup>–1</sup> arable land + X% of perennial forage crops). The coefficient of perennial forage crop effect (X) in the range of 0–1.47 can be explained by soil enrichment with nitrogen, mobilization of other nutrients, improvement of soil structure and reduction in the weed infestation of soil. The effect of perennial forage crops on grain yield increase was quantified (estimated) from the whole set of data using the above equation at X = 0 by the value +0.42 t.ha<sup>–1</sup>. The yield increase per 1 kg NPK.ha<sup>–1 </sup>of arable land amounts to 0.0501 t.ha<sup>–1</sup>, i.e. every 1% of forage crops on arable land increases the grain yield by 0.023 t.ha<sup>–1</sup> within the set. The relation between actual and theoretical yield of the whole set is demonstrated by correlation coefficient (r = 0.9332) if the effect of perennial forage crops is estimated by coefficient X = 0.95, if the effect is estimated by coefficient X = 1.47, the correlation coefficient is even higher (r = 0.9977).
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Zhang, Yan Ming, Chao Tian, Lu Ming Jiang, Yong Peng Li, Zhi Min Xiao, and Ji Lin Li. "Advantages of Perennial Crop on Conservation of Agroecological Environment." Advanced Materials Research 518-523 (May 2012): 5213–16. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5213.
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Of human activities, agriculture is perhaps the most disruptive to the functioning of ecosystems around the world. As agriculture's impact on the Earth has been amplified by industrial farming, the agroecological environment is worsening. By developing perennial crops, however, would help deal with the multiple issues involving agroecological environmental conservation and economic benefits in a world of shrinking resources. It can provide multiple ecosystem services essential for sustainable production more effectively than production systems based on annual crops, such as reducing soil erosion, minimizing nutrient leaching, sequestering more C in soils, building better pest tolerance and providing continuous habitat for wildlife. This paper presents advantages of perennial crop system in agroecological benefits, introduces the important role of perennial crop at the development of sustainable agriculture, and prospects the significant utilization of perennial crop on conservation of agroecological environment.
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Danso-Abbeam, Gideon, Khama Mohammed Amin, and Abiodun A. Ogundeji. "Enhancing Household Welfare through Perennial Crop Production in Northern Ghana." Sustainability 15, no. 1 (December 27, 2022): 451. http://dx.doi.org/10.3390/su15010451.
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As Ghana seeks to diversify its agricultural export commodity trade away from its over-reliance on cocoa, empirical evidence is critical to inform policy direction on the implementation of programs to promote such an agenda. The objective of the study was to determine whether farmers who cultivate perennial crops as their primary source of livelihood have better welfare gains than farmers who cultivate perennial crops. The study used cross-sectional data collected from 386 farming households in the northern region of Ghana. The propensity score-matching technique augmented with a control function estimator was employed in order to account for self-selection biases in household characteristics that could invalidate the quality and magnitude of the estimates. Factors identified to positively and significantly influence households’ decision to cultivate perennial crops include number of male adults in a household, farm size, membership of farmer groups, value of agricultural credit, and distance from homestead to the farm. The empirical evidence further indicated that farmers who grow perennial crops have higher welfare gains in terms of consumption expenditure per capita, household income per capita, and farm income per hectare than farmers who grow annual crops as their primary source of income. On the other hand, annual crop farmers have a wider spread of income (income diversification) than perennial crop farmers. Sensitizing farming households to engage in perennial crop production, at the very least, as an alternative source of livelihood, will aid in the fight against poverty and food insecurity, as well as improve Ghana’s macroeconomic balances through agricultural export revenue.
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Swan, A. D., M. B. Peoples, R. C. Hayes, G. D. Li, G. R. Casburn, J. I. McCormick, and B. S. Dear. "Farmer experience with perennial pastures in the mixed farming areas of southern New South Wales: on-farm participatory research investigating pasture establishment with cover-cropping." Crop and Pasture Science 65, no. 10 (2014): 973. http://dx.doi.org/10.1071/cp13448.
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In 2009, 95 farmers in the mixed farming zone of southern New South Wales (NSW), average annual rainfall 450–700 mm, were surveyed about their use of perennial pasture species. Survey responses indicated that, on average, 52% of land was under crop, 29% contained perennial pasture and 19% annual pastures. The proportion of land sown to perennial pastures and the species used differed with rainfall. Farmers identified concerns about the cost of establishment and poor survival of perennial pasture species as constraints to wider adoption. The survey also revealed that cover-cropping (sowing pasture species under the final grain crop in a cropping phase) was the dominant method of pasture establishment. Large-scale, on-farm participatory experiments were sown with the farm machinery, three at Ariah Park and one at Brocklesby in southern NSW in 2009 (annual rainfall 100 mm less than long-term average), and a further two experiments (one at each location) commenced in 2010 (annual rainfall >200 mm above average). These experiments compared the effect of cereal cover-crop sowing rate (standard rates used by the collaborating farmer and half of the standard rate) on the establishment of the perennials lucerne (Medicago sativa), phalaris (Phalaris aquatica), cocksfoot (Dactylis glomerata), and chicory (Cichorium intybus) sown in different mixes and rates with various annual legume species. The persistence and productivity of individual species were monitored for 2 years after sowing. Results indicated little or no effect of the presence of a cover-crop on the initial establishment of any of the perennials, but pasture species survival were severely affected by cover-crop sowing rates as low as half of the farmer practice (10 kg barley or 12 kg wheat ha–1) in 2009. Despite higher than average annual rainfall in 2010 and 2011, the residual effect of establishing pastures under a cover-crop in 2009 was poorer persistence and lower productivity by lucerne at the standard cover-cropping rate, and by phalaris, cocksfoot and chicory at all cover-crop rates, and an increased incidence of weeds. Similar responses to cover-cropping occurred between 2010 and 2012, even with the wetter establishment conditions in 2010, for phalaris, chicory and weeds, despite demonstration at Ariah Park that higher populations of individual perennial species could be achieved by doubling the sowing rate of pasture seed in 2010. Lucerne compensated for lower plant numbers by increasing herbage growth in response to rainfall, but phalaris could not and total pasture productivity over the first 2 years after establishment was greatly reduced by the use of cover-crops in both 2009 and 2010. Cover-cropping also reduced annual legume seedset, which could have implications for future pasture performance. Lucerne was the most consistently productive perennial pasture species evaluated regardless of establishment technique or climatic conditions.
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Zumpf, Colleen, John Quinn, Jules Cacho, Nora Grasse, Maria Cristina Negri, and DoKyoung Lee. "Invertebrate and Plant Community Diversity of an Illinois Corn–Soybean Field with Integrated Shrub Willow Bioenergy Buffers." Sustainability 13, no. 21 (November 7, 2021): 12280. http://dx.doi.org/10.3390/su132112280.
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Perennial bioenergy crop production within intensively managed agricultural landscapes has the potential to improve the sustainability, resiliency, and diversity of these landscapes. Perennial crops are ideal because of their high production potential on marginal lands relative to grain crops (e.g., corn and soybean) and their ability to provide additional ecosystem service benefits. When agricultural landscapes are designed to target specific services, determining the non-targeted services of perennial bioenergy crops can further promote their adoption. This 3-year study addresses this proposition by evaluating the canopy invertebrates and understory plant (non-target crop) communities using bee bowls and point measurement of ground coverage, respectively, within a grain field integrated with shrub willow buffer systems designed for nutrient loss reduction. Greater plant diversity and richness were observed under willow than under grain, resembling that of the surrounding riparian community with more perennial, native species. However, the same relationship did not hold true for invertebrates, with seasonality having a significant influence resulting in similar communities observed in willow and grain plots. The presence of unique plant and invertebrate species in both willow and grain crops as well as foraging pollinators on both crop and non-target crop species highlights the importance of habitat heterogeneity for supporting biodiversity and the potential benefits of buffer bioenergy landscape designs.
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Tamms, Laura, Friederike de Mol, Michael Glemnitz, and Bärbel Gerowitt. "Weed Densities in Perennial Flower Mixtures Cropped for Greater Arable Biodiversity." Agriculture 11, no. 6 (May 28, 2021): 501. http://dx.doi.org/10.3390/agriculture11060501.
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The cropping of perennial wildflower mixtures to produce biomass for use in biogas plants is one option for breaking maize’s dominance as a bioenergy feedstock. The aim of this study was to investigate the development of weeds in commercially produced perennial wildflower mixtures. Weed control during the establishment of perennial wildflower mixtures is very difficult to manage and raises the issue of the development of new weed problems when cropping perennial wildflower mixtures. In a three-year field experiment with staggered starts in four sites in northeast Germany, a perennial crop mixture was sown each year. The weeds and sown crops were surveyed annually in June. Plant densities and species numbers were counted and diversity indices calculated. Data were analysed using linear mixed models. Across all sites, weed density decreased significantly over the years of use (=cropping seasons), while weed species richness in the perennial mixture remained unchanged. The sown crop species richness significantly decreased, while the sown crop densities increased with cropping seasons. Weed density did not increase at any of the experimental sites. Although weed densities were high and crop establishment was poor in the first growing seasons, the perennial mix was able to suppress weeds in the following growing season. It was concluded that the cropping of perennial flower mixtures could contribute to biodiversity without causing new weed problems.
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Cox, C. M., K. A. Garrett, and W. W. Bockus. "Meeting the challenge of disease management in perennial grain cropping systems." Renewable Agriculture and Food Systems 20, no. 1 (March 2005): 15–24. http://dx.doi.org/10.1079/raf200495.
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AbstractPerennial grain production will likely present unique challenges for managing diseases that affect the productivity and longevity of crops being considered. Typical cultural practices effective at reducing soil- and residue-borne pathogens, such as annual crop rotations, delayed fall planting, and tillage, are not feasible in perennial systems. Consequently, soil- and residue-borne pathogens, and pathogens such as root colonizers and viruses that survive in live tissue, may increase in importance in a perennial grain crop. Resistance genes will undeniably be important defenses against disease. However, it is seldom, if ever, possible to incorporate within a single cultivar resistance to all existing and future important diseases. Furthermore, genes vulnerable to ‘boom and bust’ cycles are generally short-lived when deployed in monocultures. For these reasons, the use of mixtures of crop cultivars or species that vary in resistance functions will likely be an important strategy for managing diseases and pests of perennial grains. Burning of plant residue, a natural phenomenon in native perennial grass systems, may also be an effective disease management strategy. The successful implementation of these management tools may reduce or eliminate the risk that perennial grain crops will become pathogen refugia that affect neighboring annual plantings and the productivity of perennial plants.
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Dželetović, Željko, Gordana Andrejić, Aleksandar Simić, Hakan Geren, Uroš Aleksić, and Snežana Brajević. "Potential risks and problems in the cultivation of perennial energy crops." Journal on Processing and Energy in Agriculture 26, no. 2 (2022): 57–63. http://dx.doi.org/10.5937/jpea26-37778.
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Second-generation biofuel production systems are significantly better than first-generation systems. However, the size of areas in which the energy crops are grown depends on public support, and it decreases if public support is missing. Despite all the environmental and economic benefits, perennial energy crops do not currently play a significant role. It is believed that available land areas will be a basic limiting factor for cultivating biofuel crops in the EU. On the other hand, there is significant untapped potential for bioenergy production in abandoned and marginal land in Southeast Europe. At the same time, perennial energy crops are investments with certain risks. Economically viable production of dedicated energy crops will be difficult to achieve on most lands classified into V-VIII land capability classes. In terms of the risk of farming investments, maize has an advantage over all perennial energy crop systems. We have identified 10 types of risks for successful production of energy crops: (1) Crop water supply; (2) Weed infestation in crops; (3) Risks of frost damages; (4) Crop lodging; (5) Crop diseases and pests; (6) Short harvest periods and variable yields; (7) Economic viability of cultivation on land areas of lower land capability class; (8) Influences of agricultural practices and agro-ecological conditions on biomass quality; (9) Storage of harvested biomass and fire hazard; and (10) economic sanctions, war, and war surroundings. Although the cultivation of perennial energy crops has a perspective, it must be systematically planned and further improved.
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Kozlova, Zoya, Lyubov' Matais, and Ol'ga Glushkova. "INFLUENCE OF FODDER CROP ROTATIONS ON CROP CONFERENCE AND PRODUCTIVITY OF AGRICULTURAL CROPS IN BAIKAL REGION." Vestnik of Kazan State Agrarian University 15, no. 2 (September 8, 2020): 20–24. http://dx.doi.org/10.12737/2073-0462-2020-20-24.
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The research was carried out in Irkutsk region in 2011–2014. The purpose of this work is to study the influence of forage crop rotations on the degree of weediness of fields and the yield of forage crops. The objects of research are three forage crop rotations: one control without perennial legumes (meadow clover) and two with meadow clover in the structure of sown areas of 20 and 40%. The soil of the experimental site is gray forest heavy loamy, with the following characteristics: salt extract pH 4.7 ... 4.9, humus content 4.5 ... 4.8%, mobile phosphorus - 160 mg/kg, potassium - 130 mg/kg. The least amount of weeds in the experiment was in variants with perennial leguminous grasses (7 ... 9 pcs/m2), which ensured an increase in yield by crop rotation on average for 4 years of research by 14 ... 19%. The most contaminated was the control crop rotation. The greatest number of weeds in this crop rotation was noted in the crops of corn and pea-oat mixture - 5 ... 12 pcs/m2. Of the juvenile weeds, mainly gray mice (Setaria glauca (L.) Beauv.), wild radish (Raphanus raphanistrum), of perennial weeds, yellow sow-thistle (Sonchus arvensis L.) and field horsetail (Equisetum arvense L.) prevailed. Weediness of crops did not have a significant effect on the yield of forage crops in the links of crop rotations. Among the five-field crop rotations, the highest productivity was observed in the variant with two fields of meadow clover (2.5 thousand fodder units/ha) with the content of digestible protein in 1 fodder unit 99.1 g
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Zollinger, Richard K., and James J. Kells. "Perennial Sowthistle (Sonchus arvensis) Interference in Soybean (Glycine max) and Dry Edible Bean (Phaseolus vulgaris)." Weed Technology 7, no. 1 (March 1993): 52–57. http://dx.doi.org/10.1017/s0890037x00036861.
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Field experiments were conducted in 1987 and 1988 to examine interference from a natural population of perennial sowthistle on soybean and dry edible bean. In 1987, an average of 78 and 90 perennial sowthistle shoots per m2in 71-cm (wide) crop row spacing reduced soybean and dry edible bean yield by 49% and 36%, respectively. In 1988, a year of less precipitation, an average density of 96 and 88 shoots per m2reduced soybean and dry bean yield by 87% and 83%, respectively. One cultivation 5 wk after planting increased crop yield and decreased perennial sowthistle density compared with no cultivation. Perennial sowthistle reduced seed weight, germination percentage, and seedling growth rate of seed produced by both crops. In the presence of perennial sowthistle, one cultivation resulted in improved seed quality compared with no cultivation.
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Hayes, Richard C., Matthew T. Newell, Timothy E. Crews, and Mark B. Peoples. "Perennial cereal crops: An initial evaluation of wheat derivatives grown in mixtures with a regenerating annual legume." Renewable Agriculture and Food Systems 32, no. 3 (July 26, 2016): 276–90. http://dx.doi.org/10.1017/s1742170516000260.
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AbstractA field experiment was established to test the impact on crop yield, total productivity and biological di-nitrogen (N2) fixation of a self-regenerating annual legume, subterranean clover (Trifolium subterraneum L.), grown in mixtures with experimental perennial wheat lines. Legume content was altered in one intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & Dewey) and two wheat (Triticum aestivum L.) × wheatgrass (Th. spp.) hybrid-based stands by sowing the legume in the same drill row as the perennial crop, or in every second or third row, spatially separated from the perennial crop. The hybrid perennial crops were more vigorous than intermediate wheatgrass in year 1, competing strongly and reducing legume biomass over the 2 yr period leading to reduced inputs of fixed nitrogen (N). However, both hybrid crops declined to negligible levels following the first summer with only the intermediate wheatgrass persisting in adequate densities in year 2. Spatially separating the perennial crop from the legume in alternate drill rows increased legume biomass by 32–128% and clover regeneration by 31–195%, and reduced weed incursion by up to 47% compared with where it was sown in mixed rows. However, spatial separation more than halved grain yields in year 2 compared with where the perennial crop was grown in every drill row. This likely reflected changed competition dynamics where the modified spatial configurations at sowing limited the perennial crops’ access to resources. When estimates of the total inputs of fixed N from the clover (5–165 kg N ha−1 in year 2) were compared with the amounts of N removed in grain by the different perennial wheat treatments (10–55 kg N ha−1 in year 1), it appears feasible that a companion legume could fix sufficient N to maintain the N balance of a cropping system producing 1.5–2.0 t grain ha−1 each year. The inclusion of a legume increased total above-ground biomass by up to 142%, particularly in year 2, but this did not translate into increased grain yields. It seems unlikely that a self-regenerating annual legume will be able to effectively coexist among a dense perennial wheat canopy where both species are sown in the same drill row. Further research is required to develop strategies to channel more of the additional resources apparently accessed by the companion legume into grain production.
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Loomis, Robert S. "Perils of production with perennial polycultures." Outlook on Agriculture 51, no. 1 (January 17, 2022): 22–31. http://dx.doi.org/10.1177/00307270211063910.
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Perennial grains and polyculture were proposed ( Renewable Agriculture and Food Systems 20 (1), March 2005) as alternatives to annual grain systems. The authors criticized current annual systems as unsustainable and pointed to native prairies as a model sustainable system with no added input and little negative environmental impact. That portrayal is short-sighted. All previous efforts to breed perennial grains have resulted in crops incapable of supporting both a perennial life-habit and grain yield sufficient to address food needs. Analyses of production/uptake and partitioning of C and N resources within perennial crops confirm that a trade-off between the C and N needs of perennation and grain yield will limit efforts to create productive perennial grains. As a result, incorporating perennial life-habit into grain crops would severely constrain world food production unless the area put to farming was greatly increased. In addition, pest- and risk- management problems, which escalate when sanitizing benefits of crop rotation are abandoned, are exacerbated in polyculture. Although grains contain only small concentrations of nutrients, the amounts exported in crop yields are large. If yield is to be maintained, external inputs are essential, regardless of life-habit. Polycultures of perennial grains are seen to have little potential for producing sufficient food to serve as alternatives for current production systems.
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Bithell, S. L., R. C. Butler, A. McKay, and M. G. Cromey. "Wheat volunteers in Lolium perenne effects on Gaeumannomyces graminis var tritici carryover and takeall." New Zealand Plant Protection 64 (January 8, 2011): 175–82. http://dx.doi.org/10.30843/nzpp.2011.64.5978.
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Crop rotations can be used to manage the buildup of inoculum of Gaeumannomyces graminis var tritici (Ggt) an important pathogen that causes takeall in wheat crops This study investigated whether the value of a perennial ryegrass (Lolium perenne) break crop is impaired by the presence of wheat volunteers Soil Ggt concentrations after perennial ryegrass without wheat volunteers were approximately 20 of those with wheat but perennial ryegrass was less effective than fallow at reducing soil Ggt Wheat volunteers reduced the value of a perennial ryegrass break when they were present at densities of 40 volunteers/m2; below this density soil Ggt concentrations and takeall incidence levels were similar to the perennial ryegrass only treatment After the volunteer season under low volunteer densities (115 plants/m2) Ggt concentrations declined to below the detection level (< 5 pg DNA) within 1 year
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Sutherlin, Caitlyn, Nathaniel Brunsell, Gabriel de Oliveira, Timothy Crews, Lee R. DeHaan, and Giulia Vico. "Contrasting Physiological and Environmental Controls of Evapotranspiration over Kernza Perennial Crop, Annual Crops, and C4 and Mixed C3/C4 Grasslands." Sustainability 11, no. 6 (March 19, 2019): 1640. http://dx.doi.org/10.3390/su11061640.
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Perennial grain crops have been suggested as a more sustainable alternative to annual crops. Yet their water use and how they are impacted by environmental conditions have been seldom compared to those of annual crops and grasslands. Here, we identify the dominant mechanisms driving evapotranspiration (ET), and how they change with environmental conditions in a perennial Kernza crop (US-KLS), an annual crop field (US-ARM), a C4 grassland (US-KON), and a mixed C3/C4 grassland (US-KFS) in the Central US. More specifically, we have utilized the omega (Ω) decoupling factor, which reflects the dominant mechanisms responsible for the evapotranspiration (ET) of the canopy. Our results showed that the US-ARM site was the most coupled with the lowest decoupling values. We also observed differences in coupling mechanism variables, showing more sensitivity to the water fluctuation variables as opposed to the radiative flux variables. All of the sites showed their lowest Ω value in 2012, the year of the severe drought in the Central US. The 2012 results further indicate the dependence on the water fluctuation variables. This was especially true with the perennial Kernza crop, which displayed much higher soil moisture values. In this regard, we believe that the ability of perennial Kernza to resist water stress and retain higher soil moisture values is both a result of its deeper roots, in addition to its higher Ω value. Through the analysis of both the site comparison and the comparison of the differences in years, we conclude that the perennial Kernza crop (US-KLS) is more similar in its microclimate effects to the C4 (US-KON) and mixed C3/C4 (US-KFS) grassland sites as opposed to its annual counterpart (US-ARM). This has implications for the role of perennial agriculture for addressing agricultural resilience under changing climate conditions.
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Jefferson, P. G., G. Lyons, R. Pastl, and R. P. Zentner. "Companion crop establishment of short-lived perennial forage crops in Saskatchewan." Canadian Journal of Plant Science 85, no. 1 (January 1, 2005): 135–46. http://dx.doi.org/10.4141/p03-220.
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Short-lived perennial forages may provide producers with a cash hay crop as a viable option to diversify annual grain rotations. Little or no information on alternative annual crops for companion crop establishment of forages is available for Saskatchewan conditions. We evaluated field pea (Pisum sativum), canola (Brassica napus), and Westerwolds ryegrass (Lolium westerwoldicum) as companion crops over 3 yr (1998–2000) at three Saskatchewan sites: Swift Current (Brown soil zone), Saskatoon (Dark Brown) and Nipawin (Dark Gray). We also compared three short-lived, vigourous grass species in mixture with two alfalfa (Medicago sativa) cultivars or monoculture. Combinations of precipitation and temperature variables combined with companion crop plant density and biomass explained 90% of the variation in forage yield loss relative to no companion crop forage yield. We conclude that companion crops can be used with low yield reductions at Nipawin, but that all three companion crops significantly reduced forage yield at Swift Current. Forage seedling density was reduced under companion crops but the decline in forage seedling density did not explain the reduction in forage yield. We speculate that yield components rather than plant density must have been affected by companion crop competition. Intermediate wheatgrass (Elytrigia intermedia) produced higher forage yield than Dahurian wildrye (Elymus dahuricus) or slender wheatgrass (Elymus trachycaulus). Grass-alfalfa mixtures produced higher forage yield than grass mono culture. Economic returns were superior if no companion crop was used to establish the forages at Swift Current and Saskatoon; but, at Nipawin economic returns were generally higher with companion crop establishment. The feasibility of companion crops for establishment of short-lived perennial forages in Saskatchewan thus depends on soil zone, with their use best suited to the more humid regions. Key words: Forage yield, plant density, weather, economics
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Zhang, Yan Ming, Bo Jiang, Song Jin, Cun Yu Li, Yu Xin Li, and Ji Lin Li. "Perennial Crop: An Important Genetic Resource in Agroecosystems." Advanced Materials Research 726-731 (August 2013): 4091–94. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.4091.
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As agriculture's impact on the Earth has been amplified by industrial farming, the functioning of ecosystems around the world is disruptive. The phenomena of agroecological environment are becoming worse and worse in the arid and semi-arid regions, which has become the predominant obstacle for agriculture development. Through understanding the character of perennial crops and developing them, however, would help us to deal with the multiple issues in agroecosystems, such as agroecological environmental conservation, economic benefits and so on. It also can provide multiple ecosystem services including a new solution to the long-standing problems of soil erosion and degradation associated with conventional annual small-grain cropping systems. This paper assesses the derivation of agroecology and agroecosystems, introduces the agroecological value of perennial crop, and prospects the significant utilization of perennial crop in the future.
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Martani, Enrico, Andrea Ferrarini, and Stefano Amaducci. "Reversion of Perennial Biomass Crops to Conserve C and N: A Meta-Analysis." Agronomy 12, no. 2 (January 18, 2022): 232. http://dx.doi.org/10.3390/agronomy12020232.
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Perennial crops have been proposed as a solution to couple the production of sustainable biomass for multiple uses with several environmental benefits such as soil C storage. Concerns exist that the C sequestered in soil could be lost in a few years after the perennial crops are reverted to arable land. In this study, the current knowledge on the effects of perennial crop reversion on soil C and N was summarized by performing a meta-analysis. One year after the reversion a significant increase of soil C and N stocks (+15% and +12% respectively) were found in the 0–30 cm layer, while in the time interval between the second to fifth year after the reversion, there were no significant increases or decreases of soil C and N. The incorporation of the belowground biomass (BGB) into the soil at reversion plays a key role in the fate of soil C and N stocks after the reversion. In fact, when reverting a multiannual biomass crop there are significant losses of soil C and N. In contrast, when reverting a perennial biomass crop (PBCs) such as rhizomatous herbaceous or SRC woody crops there are no losses of soil C and N. The BGB of perennial grass is mainly composed of root systems and not of a huge amount of belowground organs as in the case of PBCs. The shredding of the BGB and its transformation as particulate organic matter (POM) represent the major pulse C input at the reversion that can undergo further stabilization into a mineral-associated organic matter (MAOM) fraction. Introducing PBCs into crop rotation resulted in an effective carbon farming solution with a potential positive legacy for food crops in terms of achievement of both climate and soil fertility goals.
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Lawes, R. A., and M. J. Robertson. "Effect of subtropical perennial grass pastures on nutrients and carbon in coarse-textured soils in a Mediterranean climate." Soil Research 50, no. 7 (2012): 551. http://dx.doi.org/10.1071/sr11320.
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In the northern agricultural region of Western Australia, some farmers have integrated C4 grass pastures into their farming system. This switch away from a farming system historically dominated by annual species could alter soil nutrient and carbon (C) levels. To explore this issue, 16 ‘over-the-fence’, pair-wise comparisons were conducted between a field in an annual crop–pasture rotation and a field sown to perennial pasture. The perennial pastures were 2–8 years of age, and comprised a mix of perennial species and volunteer annuals. Soils were deep yellow sand (Tenosols), and perennial root systems extended to beyond 150 cm. Averaged over all sites, organic C (OC) in the top 90 cm of the profile was 38.7 t/ha, nitrate 34.5 kg/ha, Colwell phosphorus (P) 5.9 kg/ha, and Colwell potassium (K) 518 kg/ha. In general, there were no differences between annuals and perennials for any of these attributes. For OC, greater differences were observed between sites than between annual and perennial species. Site differences in OC ranged from 18.7 to 62.7 t/ha. There were some differences between annuals and perennials at different sites for OC, P, nitrate, and K, but these differences were not systematic. For example, at three sites, more OC was found in the annual system; at another site, more OC was found in the perennial system, and differences occurred in the surface layers at two sites and at depth in the other two. Overall, clear differences between annual and perennial farming systems were not evident and were highly variable. The survey was augmented with a simulation study using the APSIM crop model, where a continuous perennial pasture was compared with a wheat–wheat–lupin rotation. After 10 years, there was only 1.27 t/ha more OC in the perennial system than the annual. The simulation study and on-farm survey suggest the differences in the accumulation of soil C under a perennial or an annual system in this landscape are small and variable, and if differences do exist, they will take considerable time to accrue. In addition, management and local site effects were more important than the perenniality of the system per se in influencing C and nutrient levels.
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Crézé, Cynthia M., and William R. Horwath. "Cover Cropping: A Malleable Solution for Sustainable Agriculture? Meta-Analysis of Ecosystem Service Frameworks in Perennial Systems." Agronomy 11, no. 5 (April 28, 2021): 862. http://dx.doi.org/10.3390/agronomy11050862.
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Cover crops have been touted for their capacity to enhance multifunctionality and ecosystem services (ESs). Ecosystem services are benefits which people obtain from ecosystems. Despite nearly a century of cover crop research, there has been low adoption of the practice in perennial systems of many parts of the world. Emphasis on the multi-functional dimension of cover crop outcomes may misrepresent the practice as a panacea for sustainable agriculture and distract from the need to tailor the practice to specific contexts and differing value systems. In this study, we explore how cover crop ecosystem service (ES) frameworks reflect the distinct environmental realities of perennial agriculture. We considered that ES value systems are manifested through the non-randomization of research coverage. Therefore, value systems can be elucidated through evidence-based systematic mapping. Our analysis revealed differential systems of ES valuation specific to perennial crop types. While ES frameworks are heavily contextualized, the design of seed mixes is not. We suggest that cover crop adoption could be enhanced by clearly acknowledging the different conceptualizations of agricultural sustainability addressed by various cover crops. Furthermore, explicitly delineating the competing desires of stakeholders is a crucial step in rationally selecting between various cover crop seed mix options.
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Christenson, Elizabeth, Virginia L. Jin, Marty R. Schmer, Robert B. Mitchell, and Daren D. Redfearn. "Soil Greenhouse Gas Responses to Biomass Removal in the Annual and Perennial Cropping Phases of an Integrated Crop Livestock System." Agronomy 11, no. 7 (July 15, 2021): 1416. http://dx.doi.org/10.3390/agronomy11071416.
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Diversifying agronomic production systems by combining crops and livestock (i.e., Integrated Crop Livestock systems; ICL) may help mitigate the environmental impacts of intensive single-commodity production. In addition, harvesting row-crop residues and/or perennial biomass could increase the multi-functionality of ICL systems as a potential source for second-generation bioenergy feedstock. Here, we evaluated non-CO2 soil greenhouse gas (GHG) emissions from both row-crop and perennial grass phases of a field-scale model ICL system established on marginally productive, poorly drained cropland in the western US Corn Belt. Soil emissions of nitrous oxide (N2O) and methane (CH4) were measured during the 2017–2019 growing seasons under continuous corn (Zea mays L.) and perennial grass treatments consisting of a common pasture species, ‘Newell’ smooth bromegrass (Bromus inermis L.), and two cultivars of switchgrass (Panicum virgatum L.), ‘Liberty’ and ‘Shawnee.’ In the continuous corn system, we evaluated the impact of stover removal by mechanical baling vs. livestock grazing for systems with and without winter cover crop, triticale (x Triticosecale neoblaringhemii A. Camus; hexaploid AABBRR). In perennial grasslands, we evaluated the effect of livestock grazing vs. no grazing. We found that (1) soil N2O emissions are generally higher in continuous corn systems than perennial grasslands due to synthetic N fertilizer use; (2) winter cover crop use had no effect on total soil GHG emissions regardless of stover management treatment; (3) stover baling decreased total soil GHG emissions, though grazing stover significantly increased emissions in one year; (4) grazing perennial grasslands tended to increase GHG emissions in pastures selected for forage quality, but were highly variable from year to year; (5) ICL systems that incorporate perennial grasses will provide the most effective GHG mitigation outcomes.
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Lubofsky, Evan. "The promise of perennials: Working through the challenges of perennial grain crop development." CSA News 61, no. 11 (October 28, 2016): 4–7. http://dx.doi.org/10.2134/csa2016-61-11-1.
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Coulman, Bruce, Arend Kleinhout, and Bill Biligetu. "Annual ryegrass and Festulolium as companion crops in the establishment of perennial forage crops." Canadian Journal of Plant Science 99, no. 5 (October 1, 2019): 611–23. http://dx.doi.org/10.1139/cjps-2018-0238.
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Annual companion crops are often used in new seedings of perennial forages in western Canada. Fast-establishing grass species that do not overwinter in this region have potential as companion crops to increase seeding year yields without reducing perennial forage establishment. Trials were seeded in two different years at Saskatoon and Melfort, SK, in the Dark Brown and Black soil zones, respectively. Crested wheatgrass [Agropyron cristatum (L.) Gaertn.], meadow bromegrass (Bromus riparius Rehm.), and alfalfa (Medicago sativa L.) were seeded in pure stands and mixtures with or without an annual ryegrass (Lolium multiflorum Lam.) or Festulolium (Lolium × Festuca) companion crop at two seeding rates. Forage dry matter yield in the establishment year was increased with annual ryegrass companion crops compared with no companion crop regardless of seeding rate, but was increased only with the higher rate of Festulolium at Saskatoon. Despite using low companion crop seeding rates, stand densities of most of the perennial forage stands were lower than with no companion crop at Saskatoon, but in Melfort, most stand densities did not differ. The annual ryegrass companion crop reduced yields the year after seeding at both sites, while the Festulolium also reduced yields, but not at Melfort for the lower companion crop seeding rate. Dry matter yields were usually not different between companion and no companion crop treatments in the second year after seeding and for 3-yr total yields. The use of these companion crops increased the percentage of the 3-yr total yield produced in the seeding year.
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Angus, J. F., T. P. Bolger, J. A. Kirkegaard, and M. B. Peoples. "Nitrogen mineralisation in relation to previous crops and pastures." Soil Research 44, no. 4 (2006): 355. http://dx.doi.org/10.1071/sr05138.
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Most of the nitrogen (N) used by Australian crops is mineralised from the residues of previous crops and pastures. Net N mineralisation was studied in 2 field experiments in southern NSW, one comparing different residue-management and tillage systems during continuous cropping and the other comparing residues of annual and perennial pastures in a pasture–crop system. After 14 years of continuous cropping, soil total N concentration had decreased by 50%. Neither stubble retention nor direct drilling affected potential N mineralisation or the decrease in total N. However, soil mineral N in the field was greater after direct drilling than cultivation and greater after stubble retention than stubble burning. There were 2 reasons for the discrepancy. One was because retained stubble conserved soil water, leading to periods of increased mineralisation. The other was that direct drilling and stubble retention reduced growth and N uptake by crops. In contrast to the similar rates of potential mineralisation under different tillage and stubble systems, there were significant differences following different pasture species. In a 5-year study of a pasture–crop system we measured net mineralisation following annual pasture based on subterranean clover and perennial pasture based on lucerne and/or the grasses phalaris and cocksfoot. Mineralisation generally decreased with number of years after pasture removal. Previous lucerne pastures led to slow net mineralisation in the first year after removal, apparently because of immobilisation by high C : N residues. Mineralisation in soil containing perennial grass residues was the highest measured. This high rate may be due to redistribution of N to the topsoil by roots of perennial grasses. The comparison of continuous crop and pasture–crop systems showed that the decline in soil N supply was not prevented by direct drilling and stubble conservation, but N mineralisation was increased by pastures, particularly those containing perennial grasses.
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Schlautman, Brandon, Cynthia Bartel, Luis Diaz-Garcia, Shuizhang Fei, Scott Flynn, Erin Haramoto, Ken Moore, and D. Raj Raman. "Perennial groundcovers: an emerging technology for soil conservation and the sustainable intensification of agriculture." Emerging Topics in Life Sciences 5, no. 2 (May 11, 2021): 337–47. http://dx.doi.org/10.1042/etls20200318.
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Integrating perennial groundcovers (PGC) — sometimes referred to as living mulches or perennial cover crops — into annual cash-crop systems could address root causes of bare-soil practices that lead to negative impacts on soil and water quality. Perennial groundcovers bring otherwise absent functional traits — namely perenniality — into cash-crop systems to preserve soil and regenerate water, carbon, and nutrient cycles. However, if not optimized, they can also cause competitive interactions and yield loss. When designing PGC systems, the goal is to maximize complementarity — spatial and temporal separation of growth and resource acquisition — between PGC and cash crops through both breeding and management. Traits of interest include complementary root and shoot systems, reduced shade avoidance response in the cash-crop, and PGC summer dormancy. Successful deployment of PGC systems could increase both productivity and profitability by improving water- and nutrient-use-efficiency, improving weed and pest control, and creating additional value-added opportunities like stover harvest. Many scientific questions about the inherent interactions at the cell, plant, and ecosystem levels in PGC systems are waiting to be explored. Their answers could enable innovation and refinement of PGC system design for multiple geographies, crops, and food systems, creating a practical and scalable pathway towards resiliency, crop diversification, and sustainable intensification in agriculture.
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McCallum, M. H., J. A. Kirkegaard, T. W. Green, H. P. Cresswell, S. L. Davies, J. F. Angus, and M. B. Peoples. "Improved subsoil macroporosity following perennial pastures." Australian Journal of Experimental Agriculture 44, no. 3 (2004): 299. http://dx.doi.org/10.1071/ea03076.
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Biopores left in the soil by perennial and annual pastures and their effects on macroporosity, water infiltration and the water use and productivity of subsequent wheat and canola crops were investigated in a field experiment on a Sodosol in southern New South Wales. Phases of both lucerne (4 years) and phalaris (10 years) improved the macroporosity and water infiltration into the dense B horizon compared with continuous annual crops and pastures. After removal of lucerne and phalaris, the subsoil (> 12 cm depth) contained similar numbers of pores > 2 mm diameter (228 and 190/m2, respectively) compared with a mean of 68/m2 after annual crops. However water infiltration rate after lucerne was greater than after phalaris, apparently because of more numerous pores > 4 mm, rather than a change in total porosity. The subsoil after phalaris on the other hand contained more pores 0.3 mm in diameter and a higher total porosity, possibly because of more roots around this diameter, and a longer period without traffic or cultivation. The number of lucerne biopores in the subsoil remained unchanged (170–180/m2) for at least 2 crops after the lucerne was removed although the average size decreased. The volume of water extracted from the subsoil by crops following lucerne was similar to that following annual crop/pasture for 10 of the 12 crop comparisons made. For 2 of the crops, more subsoil water (22 and 24 mm) was used after lucerne than after annuals, and in 1 season this was associated with higher yield of canola. During the 3-year study there was no winter waterlogging or post-anthesis water stress, so there was little opportunity for yield responses to improved subsoil structure. The results confirm speculation that the unfavourable structure of dense subsoils can be improved by the biological action of perennial pasture roots, although reduced wheel traffic and cultivation during the pasture phases may also play a role. Further studies will be necessary to demonstrate associated yield improvements.
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Kaipov, Yakhiya, Rifkat Akchurin, Rustam Kirayev, and Asiya Nizaeva. "Improving soil properties and productivity of crop-pasture rotation in arid steppe of the Southern Urals." BIO Web of Conferences 36 (2021): 03003. http://dx.doi.org/10.1051/bioconf/20213603003.
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Field experiments were conducted in the arid steppe zone of the Southern Urals, in the Republic of Bashkortostan of the Russian Federation. The soil is common chernozem. The precipitation during the growing season (May-September) is 166 mm. The experimental crop rotation consisted of 7 fields: 4 with perennial herbs (a mixture of Bromus inermis and Medicago varia), 3 with annual crops. The study analysed soil properties and carrying capacity in perennial grass rotation, conventional and reduced tillage. During the crop-pasture rotation, the humus content in the soil changes insignificantly depending on the tillage, being within 7.6-8.0 %. Perennial grasses loosened the soil, positively affecting moisture accumulation under crop rotation by the beginning of the pre-sowing period. The arable layer of common chernozem in the reduced tillage had a density of 1.05 g/cm3, less than 0.06 g/cm3 in conventional cultivation. Fertilizer application increased yields at 0.49-0.51 t/ha of feed units. Reduced tillage resulted in higher feed units by 0.06-0.08 tons per 1 ha. Crop-pasture rotation implementation and development ensures bioclimatically-determined yields of fodder crops and maintains soil fertility at an optimal level.
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Petruk, V. A. "PRODUCTIVITY OF PERENNIAL GRASSES AND MIXTURES WITH DIFFERENT SOWING DATES IN WESTERN SIBERIA." Bulletin of NSAU (Novosibirsk State Agrarian University), no. 1 (March 22, 2020): 24–32. http://dx.doi.org/10.31677/2072-6724-2020-54-1-24-32.
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The results of field studies for 2017 - 2019 are presented. yields of perennial grasses sown at different times of the growing season. Spring, summer, and winter sowing periods were compared. Alfalfa, clover, rump, and also their mixtures were sown in 2017 under the cover of barley. The value of the cover crop yield of spring and summer sowing periods did not differ significantly and amounted to 4-5 t / ha of absolutely dry matter. Winter barley crops have not formed. On average, over 2 years of use, the highest yields were observed in alfalfa-crust grass mixtures - 3.4 t / ha of absolutely dry matter. The lowest yield was obtained in the single-species seeding of the rump. Correspondingly, in the spring, summer and winter periods of sowing, the yield of rump was 1.6; 1.1 and 1.3 t / ha. With a late sowing period, the yield of perennial grasses is significantly lower compared to spring and summer. With winter sowing periods, the yield was the highest for grass stands of alfalfa and alfalfacrust grass mixture - 2.3 and 2.4 t / ha. It should be noted that in the second year of use, the yield by the sowing dates in single-species crops and grass mixtures is leveled. The winter crops of perennial grasses in the first year of use formed a low yield. Only in the second year (third year of life) the productivity of perennial grasses of winter sowing began to increase. Consequently, in the area under perennial grasses of the winter sowing period, during one growing season (the next year after sowing), the crop was not actually formed. Based on the data obtained, production can be recommended for spring and summer planting of perennial grasses under the cover of barley. The winter sowing period provides economically valuable crop yields only by the third year of life.
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Adelekun, Mayowa, Olalekan Akinremi, Mario Tenuta, and Paligwendé Nikièma. "Soil nitrous oxide emissions associated with conversion of forage grass to annual crop receiving annual application of pig manure." Canadian Journal of Soil Science 99, no. 4 (December 1, 2019): 420–33. http://dx.doi.org/10.1139/cjss-2018-0134.
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The disruptive land-use change during forage grass conversion to annual crop can be critical for determining nitrous oxide (N2O) emissions, but this is an understudied period. We measured soil N2O fluxes (using closed static vented chambers) together with potential environmental drivers of these fluxes from liquid pig manure (LPM) and solid pig manure (SPM) applied to an annual crop (ANN) and perennial forages (FPP) that was converted to annual crop. Unamended plots were used as a control (CON). The results showed that in 2013, average soil nitrate-N was significantly higher on the recently converted FPP (ranging from 19 to 83 mg N kg−1) than the continuous ANN plots (from 16 to 35 mg N kg−1). The recently converted perennial forage system produced three times greater N2O than the continuous annual system, which is likely a result of accelerated N mineralization from the accumulated soil organic matter (over 4 yr) and grass residues of the recently killed forage grasses. However, during the second year of the study when the FPP plots were reseeded to perennial grasses, the system emitted 30% less N2O than the ANN system. These results suggest that including perennial forage grass in rotation with annual crops can provide N-saving and climate change mitigation benefits; however, some of the N stored in the soil would be lost when the perennial grass plots are cultivated to grow annual crops.
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Hacker, Ronald B., Ian D. Toole, Gavin J. Melville, Yohannes Alemseged, and Warren J. Smith. "Managing competitive interactions to promote regeneration of native perennial grasses in semi-arid south-eastern Australia." Rangeland Journal 39, no. 1 (2017): 59. http://dx.doi.org/10.1071/rj16048.
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Treatments to reduce available soil nitrogen and achieve specified levels of weed control were evaluated for their capacity to promote regeneration of native perennial grasses in a degraded semi-arid woodland in central-western New South Wales. Treatments were factorial combinations of nitrogen-reduction levels and weed-control levels. The four levels of nitrogen reduction were no intervention, and oversowing of an unfertilised summer crop, an unfertilised winter crop or an unfertilised perennial grass. The three weed-control levels were defined by the outcome sought rather than the chemical applied and were nil, control of annual legumes and control of all annual species (AA). Regeneration of perennial grasses, predominantly Enteropogon acicularis, was promoted most rapidly by the AA level of weed control with no introduction of sown species. Sown species negated the benefits of weed control and limited but did not prevent the regeneration of native perennials. Sown species also contributed substantially to biomass production, which was otherwise severely limited under the AA level of weed control, and they were effective in reducing soil nitrogen availability. Sown species in combination with appropriate herbicide use can therefore maintain or increase available forage in the short–medium term, permit a low rate of native perennial grass recruitment, and condition the system (by reducing soil mineral nitrogen) for more rapid regeneration of native perennials should annual sowings be discontinued or a sown grass fail to persist. Soil nitrate was reduced roughly in proportion to biomass production. High levels of soil nitrate did not inhibit native perennial grass regeneration when biomass was suppressed by AA weed control, and may be beneficial for pastoral production, but could also render sites more susceptible to future invasion of exotic annuals. The need for astute grazing management of the restored grassland is thus emphasised. This study was conducted on a site that supported a remnant population of perennial grasses. Use of the nitrogen-reduction techniques described may not be appropriate on sites where very few perennial grass plants remain.
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Pfender, W. F. "Effect of Autumn Planting Date and Stand Age on Severity of Stem Rust in Seed Crops of Perennial Ryegrass." Plant Disease 88, no. 9 (September 2004): 1017–20. http://dx.doi.org/10.1094/pdis.2004.88.9.1017.
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Perennial ryegrass (Lolium perenne) grown for seed is planted in autumn for July harvest (first-year seed crop), then kept in production for subsequent yearly harvests. Plots of first-year perennial ryegrass planted in early November had only 3% as much stem rust in June as plots planted in mid-September. In other plots where fungicides were used to prevent rust development, seed yield from the November-planted plots was reduced by 23% compared with September-planted plots. In the second-year seed crop, stem rust severity in June was intermediate between severities in early- and late-planted first-year plots. The association of reduced stem rust severity with late planting for first-year crops was observed for five of six perennial ryegrass cultivars tested. Degree of reduction in disease severity due to planting date was greatest for the cultivars that had the highest disease severity in early-planted stands. Delay of autumn planting date may provide a useful cultural control method for first-year stands of perennial ryegrass seed crops.
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Tork, David G., Neil O. Anderson, Donald L. Wyse, and Kevin J. Betts. "Perennial Flax: A Potential Cut Flower Crop." HortScience 57, no. 2 (February 2022): 221–30. http://dx.doi.org/10.21273/hortsci16098-21.
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The genus Linum L. contains ≈200 primarily blue-flowered species, including several ornamentals, yet no reports exist regarding the cut flower potential of this genus. The objective of this study was to evaluate the cut flower potential of perennial flax cultivars (L. perenne L. ‘Blue Flax’ and ‘Sapphire’; Expt. 1, 2018) and accessions (L. austriacum L., L. lewisii Pursh., and L. perenne; Expt. 2, 2019), and record traits that will enable breeding and selection for improved cut flower performance. The mean vase life across both cultivars in Expt. 1 was 9.2 days. In Expt. 2, L. perenne had the longest average vase life (9.3 days), followed by L. austriacum (9.1 days) and L. lewisii (8.3 days). The floral preservative (Floralife 300) significantly increased vase life by an average of 1.7 days in Expt. 1, and 1.6 days in Expt. 2, and resulted in a significantly greater number of flowers (≈2x) in both experiments. Significant variation was observed among genotypes for most traits, including vase life (6.2 to 11.3 days) and number of flowers (1.3 to 10.5), highlighting the opportunities for improving the potential of cut flower perennial flax through breeding.
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Hmielowski, Tracy. "Napiergrass as a Dual-Use Perennial Crop." CSA News 64, no. 7 (July 2019): 4–5. http://dx.doi.org/10.2134/csa2019.64.0701.
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Reimann-Philipp, R. "Perennial Spring Rye as a Crop Alternative)." Journal of Agronomy and Crop Science 157, no. 4 (December 1986): 281–85. http://dx.doi.org/10.1111/j.1439-037x.1986.tb00077.x.
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Akiyama, T., and P. K. Trivedi. "Vintage production approach to perennial crop supply." Journal of Econometrics 36, no. 1-2 (September 1987): 133–61. http://dx.doi.org/10.1016/0304-4076(87)90047-9.
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Tork, David G., Neil O. Anderson, Donald L. Wyse, and Kevin J. Betts. "Domestication of Perennial Flax Using an Ideotype Approach for Oilseed, Cut Flower, and Garden Performance." Agronomy 9, no. 11 (November 1, 2019): 707. http://dx.doi.org/10.3390/agronomy9110707.
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Flaxseed (Linum usitatissimum) has recently grown in popularity as a health food due to its high levels of omega-3 fatty acids. Many undomesticated Linum species possess a similar oil profile, in addition to perenniality, and could, therefore, provide similar products in addition to ecosystem services such as soil retention, improvements in water quality, and pollinator services. Many Linum species also possess ornamental qualities, e.g., blue flowers, which could provide added value as a new cut flower crop or garden herbaceous perennial. A perennial flax breeding program will be initiated by screening of Linum accessions for key agronomic and horticultural traits. Herein, we outline an ideotype approach which will enable identification of top herbaceous perennial candidates for domestication based on qualities relevant to oilseed, cut flower, and garden herbaceous perennial crop uses. In this review, we summarize the concept of ideotype breeding as it relates to perennial crop domestication and outline considerations for ideotype design. The tools outlined herein should prove useful to other breeders and especially for undomesticated crops. Whether the ideotype concept is applied as a framework for selection or simply as a means of generating hypotheses, applying this approach can provide structure to breeding programs with complex objectives.
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Avelino, Jacques, Clémentine Allinne, Rolando Cerda, Laetitia Willocquet, and Serge Savary. "Multiple-Disease System in Coffee: From Crop Loss Assessment to Sustainable Management." Annual Review of Phytopathology 56, no. 1 (August 25, 2018): 611–35. http://dx.doi.org/10.1146/annurev-phyto-080417-050117.
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Assessment of crop loss due to multiple diseases and pests (D&P) is a necessary step in designing sustainable crop management systems. Understanding the drivers of D&P development and yield loss helps identify leverage points for crop health management. Crop loss assessment is also necessary for the quantification of D&P regulation service to identify promising systems where ecosystem service provision is optimized. In perennial crops, assessment of crop losses due to D&P is difficult, as injuries can affect yield over years. In coffee, one of the first perennials in which crop loss trials were implemented, crop losses concurrent with injuries were found to be approximately 50% lower than lagged losses that originated following the death of productive branches due to D&P. Crop losses can be assessed by field trials and surveys, where yield reduction factors such as the number of productive branches that have died are quantified, and by modeling, where damage mechanisms for each injury are considered over several years.
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Crews, T. E. "Perennial crops and endogenous nutrient supplies." Renewable Agriculture and Food Systems 20, no. 1 (March 2005): 25–37. http://dx.doi.org/10.1079/raf200497.
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AbstractPerennial cropping systems may achieve significant improvement over annual systems in the synchrony between crop nutrient demands and nutrient supplies. Improvements in nutrient synchrony would result in the reduction of nutrient losses and their associated environmental impacts. A perennial system with high levels of synchrony would also require fewer nutrient inputs, such that it may be possible to develop an agriculture that functions mostly, if not entirely, on nutrient inputs from endogenous sources (i.e., weathering of primary and secondary minerals and biological nitrogen fixation). In this paper I describe three realms of research that will inform the development of relatively high-yielding grain production systems grown on endogenous nutrient supplies: (1) improvement of nutrient synchrony through the development of perennial crops; (2) identification of soils that are in a high nutrient release phase of pedogenesis, which could balance the export of rock-derived nutrients in crop harvests; and (3) optimization of legume density, harvest index and percent nitrogen derived from the atmosphere (%Ndfa) to achieve adequate nitrogen inputs through biological fixation.
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DeHaan, L. R., D. L. Van Tassel, and T. S. Cox. "Perennial grain crops: A synthesis of ecology and plant breeding." Renewable Agriculture and Food Systems 20, no. 1 (March 2005): 5–14. http://dx.doi.org/10.1079/raf200496.
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AbstractPerennial grain crops would address many agricultural problems, including soil erosion, nutrient loss and pesticide contamination. Doubts about the possibility of perennial grain crops rest upon two assumptions: (1) that the relationship between yield and longevity is a fixed function that cannot be influenced by selection, mutation or environmental changes; and (2) that yield and longevity trade off in a bivariate manner to the exclusion of all other traits. These assumptions are consistent with the phenotypic trade-off model, but recent research suggests that a quantitative genetic model is a more appropriate approach to trade-offs. In the quantitative genetic model, environmental and genetic changes can result in increases in two traits simultaneously even when a trade-off, or negative correlation, exists between the two traits. Empirical evidence that the trade-off between perenniality and reproductive allocation is not fixed comes from wild, herbaceous perennials that can produce more than 2000 kg seed ha−1 in the temperate zone, and herbaceous perennial crops that produce on average 8900 kg fruit ha−1 in the tropics. Ecological literature suggests that most perennials produce small amounts of seed relative to their vegetative growth not as a physiological absolute, but rather as a result of natural selection in a stable, competitive environment favoring longevity. By selecting strongly for seed yield in a population of perennial plants, the plant breeder can likely achieve that which is rare in nature—a high seed-yielding perennial plant. The same general methodologies that have allowed annual grain breeders to increase grain yield and push many combinations of negatively correlated traits to levels of expression not seen in nature are available to the perennial grain breeder. Perennial grain breeders are integrating ecological principles and traditional plant breeding methods in their efforts to develop perennial grain wheat (Triticum spp.), sorghum (Sorghum spp.), sunflower (Helianthus spp.), Illinois bundleflower (Desmanthus illinoensis) and rice (Oryza spp.).
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Gulden, Robert H., Derek W. Lewis, Jane C. Froese, Rene C. Van Acker, Gary B. Martens, Martin H. Entz, Doug A. Derksen, and Lindsay W. Bell. "The Effect of Rotation and In-Crop Weed Management on the Germinable Weed Seedbank after 10 Years." Weed Science 59, no. 4 (December 2011): 553–61. http://dx.doi.org/10.1614/ws-d-11-00001.1.
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Agricultural production systems that reduce the use of in-crop herbicides could greatly reduce risks of environmental damage and the development of herbicide-resistant weeds. Few studies have investigated the long-term effects of in-crop herbicide omissions on weed seedbank community size and structure. A crop-rotation study was sampled 10 yr after a strictly annual rotation and an annual/perennial rotation were exposed to different in-crop herbicide omission treatments. In-crop herbicides were applied either in all annual crops (control), omitted from oats only, or omitted from both flax and oats. Seedbank densities were greatest when in-crop herbicides were omitted from flax and oats, and this treatment also reduced crop yield. Shannon-Wiener diversity differed among crops in the annual crop rotation and among herbicide omission treatments in the perennial rotation. Herbicide omissions changed the weed-community structure in flax and in wheat and canola crops in the annual rotation enough to warrant alternate control methods in some treatments. The magnitude of the effects on the seedbank parameters depended largely on the competitive ability of the crop in which herbicides were omitted. No yield response to omitting herbicides in oats indicated that standard weed management practices have reduced weed populations below yield-loss thresholds.
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Сочнева, Svetlana Sochneva, Миннулин, Genadiy Minnulin, Сафиоллин, and Faik Safiollin. "Change of physical and chemical properties of grey forest soil of Tatarstan agrocenosis under the influence of Alfalfa cultivated on different mineral nutrition backgrounds." Vestnik of Kazan State Agrarian University 8, no. 3 (October 24, 2013): 139–43. http://dx.doi.org/10.12737/1382.
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In the world more than 100 types of crops are cultivated on the fodder purposes, including perennial grasses, corn, fodder and forage crops account, which provides about 70% of the livestock’s necessity. Among the perennial grasses, the leading position, both in areas under crops and the yield, is alfalfa crop, which is grown in 165 countries around the world according to the Food and Agricultural Organization of the United Nations, especially in the countries of Americas (20-25 million hectares). Furthermore, the palatability ratio of green and dry alfalfa is significantly higher, compared to other legumes perennial grasses. It is difficult to overestimate the importance of alfalfa forage production in the modern forage production. This paper presents the current issues of growing alfalfa on different backgrounds of mineral nutrition. In our country its acreage needs to be expanded to 350 hectares (40% of the acreage of perennial grasses), because the farming biologization without the inclusion this crop in the field, forage and farms crop rotation is theoretically impossible and not feasible. In order to obtain the high biomass of at least 23 tons per hectare and agriculture biologization on gray forest soils of the Republic of Tatarstan we recommend to cultivate alfalfa mixed with awnless rump and meadow fescue in the ratio of 0,70:0,15:0,15. In households with high use of chemicals so that to obtain for more than 36 tons per hectare of green herbage mass in polyspecific grasses, it should prevail crop components (awnless rump and meadow fescue), which are in a leading position, according to the impact on the agro biological properties of the soil of Kama zone of the Republic of Tatarstan.
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Пинчук, Viktor Pinchuk, Рябичева, Angelina Ryabicheva, Стрельцов, Vladimir Streltsov, Стрельцова, and Zoya Streltsova. "The quality of pork according to the back fat thickness." Vestnik of Kazan State Agrarian University 8, no. 3 (October 24, 2013): 144–47. http://dx.doi.org/10.12737/1384.
Full textAbstract:
In the world more than 100 types of crops are cultivated on the fodder purposes, including perennial grasses, corn, fodder and forage crops account, which provides about 70% of the livestock’s necessity. Among the perennial grasses, the leading position, both in areas under crops and the yield, is alfalfa crop, which is grown in 165 countries around the world according to the Food and Agricultural Organization of the United Nations, especially in the countries of Americas (20-25 million hectares). Furthermore, the palatability ratio of green and dry alfalfa is significantly higher, compared to other legumes perennial grasses. It is difficult to overestimate the importance of alfalfa forage production in the modern forage production. This paper presents the current issues of growing alfalfa on different backgrounds of mineral nutrition. In our country its acreage needs to be expanded to 350 hectares (40% of the acreage of perennial grasses), because the farming biologization without the inclusion this crop in the field, forage and farms crop rotation is theoretically impossible and not feasible. In order to obtain the high biomass of at least 23 tons per hectare and agriculture biologization on gray forest soils of the Republic of Tatarstan we recommend to cultivate alfalfa mixed with awnless rump and meadow fescue in the ratio of 0,70:0,15:0,15. In households with high use of chemicals so that to obtain for more than 36 tons per hectare of green herbage mass in polyspecific grasses, it should prevail crop components (awnless rump and meadow fescue), which are in a leading position, according to the impact on the agro biological properties of the soil of Kama zone of the Republic of Tatarstan.
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Chebotarev, N. T., and O. V. Brovarova. "The effect of long-term use of organic and mineral fertilizers on the productivity of agrocenoses of the European Northeast." Agrarian science, no. 5 (June 17, 2022): 87–92. http://dx.doi.org/10.32634/0869-8155-2022-359-5-87-92.
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Relevance. The soil cover of the Komi Republic is dominated by podzolic and sodpodzolic soils, which are characterized by very low natural fertility, therefore, liming, organic and mineral fertilizers must be used to widely reproduce the fertility and productivity of these soils.Methods. The fodder crop rotation had the following alternation of crops: 1 — potatoes; 2 — vico-oat mixture with sowing of perennial grasses; 3 — perennial grasses of the 1st year of use; 4 — perennial grasses of the 2nd year of use; 5 — vico-oat mixture; 6 — potatoes. Organic fertilizers in the form of peat–manure compost (TNK) were introduced twice during the rotation of the crop rotation — for potatoes, mineral fertilizers in the form of Naa, Rsd and Kx during basic tillage, during the cultivation of perennial grasses, as well as during spring fertilizing of plants. To replenish the removal of nutrients by crops, annual doses of mineral fertilizers were N60P30K180 for potatoes, N40P32K116 for vico-oat mixture, and N40P32K108 for perennial grasses (Trifolium pratense + Phleum pratense). In the experiment were also used reduced doses (1/2 and 1/3 of the full dose of NPK).Results. The humus content increased by 0.5%, the exchange acidity decreased to 6.8 units of pHKCl, the hydrolytic acidity was 0.6 mmol/100 g of soil, the amount of mobile phosphorus was 312 mg/kg and the exchange potassium was 164 mg/kg of soil. A significant average yield of agricultural crops was obtained: potatoes — 7.0 t/ha, annual grasses — 4.4 t/ha and perennial grasses — 6.2 t/ha of dry matter with high quality