Academic literature on the topic 'Perennial crop'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Perennial crop.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Perennial crop"
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.
Full textAbstract:
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.
2
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.
Full textAbstract:
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.
3
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.
Full textAbstract:
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.
4
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.
Full textAbstract:
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.
5
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.
Full textAbstract:
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.
6
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.
Full textAbstract:
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.
7
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.
Full textAbstract:
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.
8
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.
Full textAbstract:
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.
9
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.
Full textAbstract:
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).
10
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.
Full textAbstract:
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.
Dissertations / Theses on the topic "Perennial crop"
1
Alexander, Peter Mark William. "Modelling the UK perennial energy crop market." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9645.
Full textAbstract:
Biomass produced from perennial energy crops, Miscanthus and willow or poplar grown as short-rotation coppice, is expected to contribute to UK renewable energy targets and reduce the carbon intensity of energy production. The UK Government has had incentives in place, targeting farmers and power plant investors to develop this market, but growth has been slower than anticipated. Market expansion requires farmers to select to grow these crops, and the construction of facilities, such as biomass power plants, to consume them. Farmer behaviour and preferences, including risk-aversion, are believed to be important to crop selection decisions. Existing research estimating the total potential resource has either only simplistically considered the farmer decision-making and opportunity costs, or has not considered spatial variability. No previous work has modelled the contingent interaction of farmers’ decisions with the construction of biomass facilities. This thesis provides an improved understanding of the behaviour of the perennial energy crop market in the UK, by addressing these limitations, to understand the spatial and temporal dynamics of energy crop adoption. It attempts to determine the factors that govern the rate and level of adoption, to quantify the greenhouse gas abatement potential, and to assess the cost effectiveness of policy mechanisms. A farm-scale mathematical programming model was implemented to represent the crop selection of a risk-averse farmer. This was applied using spatially specific data to produce maps and cost curves economic supply, for the UK. To represent the contingent interaction of supply and demand within the market, an agent-based model was then developed. The results indicate that perennial energy crop supply may be substantially lower than previously predicted, due to the time lags caused by the spatial diffusion of farmer adoption. The model shows time lags of 20 years, which is supported empirically by the analogue of oilseed rape adoption. Results from integrating a greenhouse gas emissions balance shows that directly supporting farmers, via establishment grants, can increase both the carbon equivalent emissions abatement potential and cost effectiveness of policy measure. Results also show a minimum cost of carbon abatement is produced from scenarios with an intermediate level of electricity generation subsidy. This suggests that there is a level of support for electricity generated from energy crops that reduces emissions in the most cost effective manner.
2
Zhang, Xiaohua 1964. "Price expectations in perennial crop supply models." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291531.
Full textAbstract:
In the analysis of investment and production decisions for perennial crops, expectations play a critical role. This thesis studied three hypotheses about price expectations and reviewed five supply response models for perennial crops. An empirical model for the apple industry was developed to test alternative representations of expected prices. The naive and adaptive expectation model performed well with national data, whereas moving averages of price and the adaptive expectations model performed better with Washington data. To improve estimates of supply response for perennial crops, better data are needed to describe new plantings, removals, the age distribution of trees, production costs, and climatic conditions. Rapid technological change in the U.S. apple industry may cause producers to revise the way they form expected prices, encouraging them to use more historical information and paying more attention to projections of future demand. Rational expectations perspectives may become increasingly relevant.
3
Huggett, David Alan John. "Potential insect pests of the biomass crop Miscanthus." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/7180.
Full text
4
Koivisto, Jason M. "Semi-leafless peas : a cover crop for establishing lucerne or red clover." Thesis, Coventry University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246331.
Full text
5
Xue, Yao. "Accessing Chilling Conditions For Perennial Fruit Crop Production in Kentucky." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1486.
Full textAbstract:
Temperate Region fruit and nut trees, and many other perennial plants, require cool winter temperatures (chilling hours) to ensure leaf and flower bud production in the following season. Temperate Regions are characterized by variable winter and spring temperatures. Failure of meeting sufficient chilling requirement results in deformed fruits, unequal maturation, and other plant deformities, thereby reducing quality and yields. Chilling requirements are expressed as number of accumulated hours within a range of approximately 32º to 45ºF or 0º to 7.2ºC. These requirements are specific for level of temperature, length of temperature period, and species and cultivar of plants. Information on chilling hour production by the diverse Kentucky environments and chilling requirements of its plants is limited. Global warming is reducing the occurrence and length of chilling conditions, thereby negatively impacting perennial fruit production (IPCC, 2014). There is increasing interest in fruit crops by the state’s producers and consumers. The Kentucky Mesonet Weather System provides temperature data, which can readily be converted to chilling units. Also, commercial nurseries are beginning to publish chilling requirement data for their fruit stocks. The present study included data collected over A 5-years period at 33 Mesonet sites. The average number of chilling hours overall years and sites was 1544, year means ranged from 1427 to 1842, sites means ranged from 1422 to 1682. Chilling hour production exceeded chilling requirements of fruit and nut crops commonly grown in Kentucky.
6
Shortall, Orla. "Rethinking bioenergy from an agricultural perspective : ethical issues raised by perennial energy crop and crop residue production for energy in the UK and Denmark." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28756/.
Full textAbstract:
The aim of this project is to explore the social and ethical dimensions of the agricultural production of perennial energy crop and crop residues for energy. Biomass – any living or recently living matter – is being promoted in industrialised countries as part of the transition from fossil fuels to an economy based on renewable energy. Various challenges face the use of bioenergy however. One particularly controversial and high profile example has been the use of food crop biofuels in transport which are seen to conflict with food production and to cause significant environmental damage. Suggested ways around these controversies is the production of perennial energy crops such as grasses and trees and crop residues such as straw, which are seen to require fewer inputs and less prime land. Some have analysed the controversies raised by biofuels in terms of controversies around industrial agriculture more broadly: biofuels are perceived to be large scale, monocultural, environmentally damaging and pushed by agri-business and energy interests. This project asks what type of agriculture system perennial energy crops and crop residues are seen as developing within, if at all. This was considered worth exploring because the type of system will have a large bearing on how they are received in future. To this end a theoretical framework of different paradigms of agriculture ranging from industrial agriculture at one end to alternative agriculture at the other was developed and applied to the data. Interviews with key stakeholders and analysis of key documents in the UK and Denmark were carried out to address the question of how perennial energy crops and crop residues are seen as overcoming previous controversies raised by food crop biofuels, in terms of their place in agricultural systems. The thesis argues that stakeholder’s visions of perennial energy crops and crop residues can be understood in terms of four models of agriculture: two industrial and two alternative. These are called “industrialism lite” that involves producing perennial energy crops on marginal land; life sciences integrated agriculture including the biorefinery strategy; multifunctional perennial energy crop production on environmentally marginal land; and ecologically integrated multipurpose biomass production through agroforestry production. There is also an argument which cuts across the paradigms and maintains that regardless of the type of agricultural system used very little or no biomass should be produced for the energy sector because of the scale of resources it requires and the scale of society’s energy use. These positions can be summarised as three different ways to overcome challenges raised by food crop biofuels: further industrialise agriculture; de-industrialise agriculture; and de-industrialise agriculture and reduce society’s energy use, though biomass could still only be used to a very limited extent, if at all, in energy production.
7
McKenzie, Scott. "An aboveground-belowground herbivore interaction in a woody perennial crop and its response to elevated atmospheric CO2." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/73333/.
Full textAbstract:
Interactions between above ground and root-feeding herbivores can be influenced by changes in plant traits, such as tissue chemistry and morphology. Environmental heterogeneity and perturbations also affect these plant-mediated interactions. Climate change is a multi-faceted phenomenon; increases in atmospheric carbon dioxide (CO2) concentrations lead to increased global mean temperature and an associated higher frequency of extreme weather events. These factors can potentially perturb ecosystem function by altering both plant–herbivore and herbivore–herbivore interactions. A detailed understanding of whether above–belowground interactions are affected by climate change remains lacking. In an attempt to fill knowledge gaps in this understudied area of ecology, this thesis investigates, through a series of glasshouse experiments, the effects of elevated CO2 and other aspects of climate change, such as altered phenology, on the interspecific interaction between the aboveground large raspberry aphid (Amphorophora idaei) and the root feeding larvae of the vine weevil (Otiorhynchus sulcatus), mediated by the shared raspberry (Rubus idaeus) host-plant. Under ambient climate conditions, reciprocal feeding facilitation was observed to occur between aphids and vine weevil larvae feeding on raspberry, with the presence of one increasing the abundance of the other herbivore, and vice versa. This occurred regardless of plant cultivar and order of herbivore arrival on the plant. It is likely that this facilitative relationship is driven by over-compensatory plant growth in response to herbivory. Although tougher, adult vine weevils show a feeding preference for leaves grown in elevated CO2. Herbivory may be more influential than CO2 in determining plant–herbivore interaction outcomes. Aphids affect plant intraspecific competition to a greater extent than elevated CO2 by altering plant biomass of both infested and non-infested plants. In conclusion, this particular plant–herbivore system would seem to be relatively robust in the face of possible future CO2 concentration scenarios.
8
CHIMENTO, CARLO. "ASSESSMENT OF THE CARBON SEQUESTRATION POTENTIAL IN SOIL AND IN BELOWGROUND BIOMASS OF SIX PERENNIAL BIOMASS CROP." Doctoral thesis, Università Cattolica del Sacro Cuore, 2015. http://hdl.handle.net/10280/6072.
Full textAbstract:
L'obiettivo della ricerca è stato quello di identificare la coltura bioenergetica con il maggior potenziale di sequestro del carbonio (C); sono state considerate tre colture perenni arboree (pioppo, robinia e salice) e tre colture erbacee perenni (canna comune , miscanto e panico ) al sesto anno dal loro impianto e coltivate nello stesso ambiente.
In primo luogo sono state misurate le variazioni dei tassi del C organico del suolo (COS) per il primo 1 m, mentre per i primi 30 cm di suolo è stato stimato il grado di stabilita del COS valutando sette frazioni di COS che presentano differenti gradi di stabilizzazione; in secondo luogo, sono stati caratterizzati gli apparati radicali delle sei specie per la stessa profondità di suolo, per valutare dove le specie accumulano la biomassa radicale lungo il profilo di suolo. I risultati confermano che l’impianto di colture bioenergetiche perenni su superfici precedentemente dedite a colture annuali gestite convenzionalmente rappresenta una opzione valida per sequestrare C nel soulo. Tuttavia, è stata osservata una diversa capacità di sequestro di C tra specie arboree ed erbacee: le specie arboree hanno dimostrato aumentre il contenuto di COS nel primo strato di suolo ( 0-10 cm di suolo), ma la loro capacità di allocare biomassa radicale negli strati profondi del suolo è limitata; mentre, la specie erbacee allocano un’alta quantità di biomassa radicale negli strati profondi del suolo, ma solo il panico ed il miscanto hanno aumentato il contenuto di C nel primo strato di suolo.The objective of the present research was to identify the bioenergy crop with the greatest carbon sequestration potential among three perennial woody crops (poplar, black locust and willow) and three perennial herbaceous crops (giant reed, miscanthus and switchgrass) at the sixth year from plantation and in the same location. First of all the SOC stock variations for the first 1 m soil depth and the quantification of seven soil C fractions related to SOC stabilization level of the first 30 cm of soil were assessed; secondly, a characterization of the root system and the traits which affect the carbon allocation in soil were considered. The results confirm that the establishment of perennial bioenergy crops in previous arable fields can be a suitable option to sequester carbon (C) belowground. However, a different C sequestration capacity was observed between woody and herbaceous crops: woody species showed the greatest SOC sequestration potential in the first soil layer (0-10 cm of soil) but their ability to allocate root biomass in the deeper soil layers was limited; while, the herbaceous species allocated a high amount of root biomass in the deeper soil layers, but only switchgrass and miscanthus sequester C in the first soil layer.
9
CHIMENTO, CARLO. "ASSESSMENT OF THE CARBON SEQUESTRATION POTENTIAL IN SOIL AND IN BELOWGROUND BIOMASS OF SIX PERENNIAL BIOMASS CROP." Doctoral thesis, Università Cattolica del Sacro Cuore, 2015. http://hdl.handle.net/10280/6072.
Full textAbstract:
L'obiettivo della ricerca è stato quello di identificare la coltura bioenergetica con il maggior potenziale di sequestro del carbonio (C); sono state considerate tre colture perenni arboree (pioppo, robinia e salice) e tre colture erbacee perenni (canna comune , miscanto e panico ) al sesto anno dal loro impianto e coltivate nello stesso ambiente.
In primo luogo sono state misurate le variazioni dei tassi del C organico del suolo (COS) per il primo 1 m, mentre per i primi 30 cm di suolo è stato stimato il grado di stabilita del COS valutando sette frazioni di COS che presentano differenti gradi di stabilizzazione; in secondo luogo, sono stati caratterizzati gli apparati radicali delle sei specie per la stessa profondità di suolo, per valutare dove le specie accumulano la biomassa radicale lungo il profilo di suolo. I risultati confermano che l’impianto di colture bioenergetiche perenni su superfici precedentemente dedite a colture annuali gestite convenzionalmente rappresenta una opzione valida per sequestrare C nel soulo. Tuttavia, è stata osservata una diversa capacità di sequestro di C tra specie arboree ed erbacee: le specie arboree hanno dimostrato aumentre il contenuto di COS nel primo strato di suolo ( 0-10 cm di suolo), ma la loro capacità di allocare biomassa radicale negli strati profondi del suolo è limitata; mentre, la specie erbacee allocano un’alta quantità di biomassa radicale negli strati profondi del suolo, ma solo il panico ed il miscanto hanno aumentato il contenuto di C nel primo strato di suolo.The objective of the present research was to identify the bioenergy crop with the greatest carbon sequestration potential among three perennial woody crops (poplar, black locust and willow) and three perennial herbaceous crops (giant reed, miscanthus and switchgrass) at the sixth year from plantation and in the same location. First of all the SOC stock variations for the first 1 m soil depth and the quantification of seven soil C fractions related to SOC stabilization level of the first 30 cm of soil were assessed; secondly, a characterization of the root system and the traits which affect the carbon allocation in soil were considered. The results confirm that the establishment of perennial bioenergy crops in previous arable fields can be a suitable option to sequester carbon (C) belowground. However, a different C sequestration capacity was observed between woody and herbaceous crops: woody species showed the greatest SOC sequestration potential in the first soil layer (0-10 cm of soil) but their ability to allocate root biomass in the deeper soil layers was limited; while, the herbaceous species allocated a high amount of root biomass in the deeper soil layers, but only switchgrass and miscanthus sequester C in the first soil layer.
10
Weeks, James Michael Jr. "Perennial Grass Based Crop Rotations in Virginia: Effects on Soil Quality, Disease Incidence, and Cotton and Peanut Growth." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35394.
Full textAbstract:
In 2003 eight peanut and cotton crop rotations were established in southeastern Virginia,
4 of which included 2 or 3 years of tall fescue or orchardgrass grown as high-value hay crops.
Each crop rotation was evaluated for changes in soil quality indicators including soil carbon and
nitrogen, water stable soil aggregates, plant available water content, bulk density, cone index
values, and soil moisture. Cotton and peanut growth and yield were also observed to evaluate
changes in crop growth associated with differences in soil quality. Soilborne plant pathogens including root-knot nematode, stubby root nematode, ring nematode, stunt nematode, and
Cylindrocladium parasiticum microsclerotia were measured in the spring and fall of each year to
determine differences associated with crop rotations. Water stable soil aggregates in 2007 were higher in rotations with 3 years of either perennial grass. Soil moisture tended to be the highest at depths 30 - 60 cm in the 3-year tall fescue rotation in August and September 2007. Cotton in 2006 and peanut in 2007 had higher growth and yield where the annual crop directly followed a perennial grass. Root-knot nematode tended to decrease in all rotations over time. Stubby root nematode populations tended to increase in rotations with either duration of orchardgrass. Including perennial grasses in cotton and peanut rotations has the potential to increase growth and yield as demonstrated in this research.Master of Science
Books on the topic "Perennial crop"
1
Weaver, Robert D. An integrated model of perennial and annual crop production for Sub-Saharan countries. [Washington, D.C.] (1818 H St. NW, Washington 20433): International Economics Dept., The World Bank, 1989.
Find full text
2
Perennial vegetables: From artichoke to zuiki taro, a gardener's guide to over 100 delicious, easy-to-grow edibles. White River Junction, Vt: Chelsea Green Pub., 2007.
Find full text
3
Toensmeier, Eric. Perennial vegetables: From artichoke to zuiki taro, a gardener's guide to over 100 delicious, easy-to-grow edibles. White River Junction, Vt: Chelsea Green Pub., 2007.
Find full text
4
Flood, J., P. D. Bridge, and M. Holderness, eds. Ganoderma diseases of perennial crops. Wallingford: CABI, 2000. http://dx.doi.org/10.1079/9780851993881.0000.
Full text
5
J, Flood, Bridge P. D, and Holderness M, eds. Ganoderma diseases of perennial crops. Wallingford, Oxon [England]: CABI, 2000.
Find full text
6
A, Hammerschlag F., and Litz Richard E, eds. Biotechnology of perennial fruit crops. Wallingford, Oxon, UK: C.A.B. International, 1992.
Find full text
7
AGRICULTURE, US DEPARTMENT OF. Lancer perennial pea. [Washington, D.C.]: U.S. Dept. of Agriculture, 1986.
Find full text
8
Food and Agriculture Organization of the United Nations., ed. Breeding for durable resistance in perennial crops. Rome: Food and Agriculture Organization of the United Nations, 1986.
Find full text
9
Kosolapov, Vladimir, Bilus Sharifyanov, Halyaf Ishmuratov, Fanuz Shagaliev, Idris Yumaguzin, and Eduard Salihov. Bulky forage from legume-cereal mixtures in cattle rations. ru: Federal Williams Research Center of Forage Production and Agroecology, 2021. http://dx.doi.org/10.33814/monography_2021_184.
Full textAbstract:
The results of our own scientific research on the use of advanced technologies for the procurement, storage and use of voluminous forage prepared from legume-cereal grass mixtures, as well as silos preserved with new generation biological preparations Biosib and Biotrof-111 are presented. The ways and methods of improving the structure of sown areas during the cultivation of perennial legume-cereal grass mixtures with the inclusion of an unconventional forage crop - the eastern goat's rue are considered in order to increase the energy and protein nutritional value of voluminous forages. The possibility of using the energy feed additive Bergafat T-300 in winter rations for feeding highly productive fresh cows has been shown. The book can serve as a scientific and methodological guide for drawing up effective programs and long-term plans for the development of forage production and feeding of cattle.
10
Barth, Susanne, Donal Murphy-Bokern, Olena Kalinina, Gail Taylor, and Michael Jones, eds. Perennial Biomass Crops for a Resource-Constrained World. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44530-4.
Full textBook chapters on the topic "Perennial crop"
1
Paul, Florie, François Ruf, and Yoddang. "Diversification and Perennial-Crop Cycles in Aceh, Indonesia." In Economics and Ecology of Diversification, 323–40. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-7294-5_16.
Full text
2
Johnson, Dennis V., and P. K. R. Nair. "Perennial crop-based agroforestry systems in northeast Brazil." In Agroforestry Systems in the Tropics, 475–87. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2565-6_29.
Full text
3
Boincean, Boris, Grigore Rusnac, Vadim Cuzeac, Lidia Bulat, Sergiu Gavrilas, Denis Zaharco, and Doria Pasat. "Agronomic Benefits of Perennial Crops and Farmyard Manure in Crop Rotations." In Regenerative Agriculture, 273–79. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72224-1_24.
Full text
4
Shakeel, Qaiser, Guoqing Li, Yang Long, and Hafiz Abdul Samad Tahir. "Development and Implementation of IDM Program for Annual and Perennial Crops." In Sustainability in Plant and Crop Protection, 295–327. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35955-3_15.
Full text
5
Zhu, X. G., T. G. Chang, Q. F. Song, J. Finnan, S. Barth, L. M. Mårtensson, and M. B. Jones. "A Systems Approach Guiding Future Biomass Crop Development on Marginal Land." In Perennial Biomass Crops for a Resource-Constrained World, 209–24. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44530-4_18.
Full text
6
Mkomwa, Saidi, Amir Kassam, Sjoerd W. Duiker, and Nouhoun Zampaligre. "Livestock integration in conservation agriculture." In Conservation agriculture in Africa: climate smart agricultural development, 215–29. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789245745.0012.
Full textAbstract:
Abstract Grazing livestock have been presented as an unsurmountable obstacle for Conservation Agriculture (CA) in Africa, because they consume organic cover. But grazing livestock can also make positive contributions to CA, while, if properly managed, sufficient organic cover can be left for soil erosion control and soil health improvement. Urine and manure improve soil fertility and soil health, and increase the agronomic efficiency of fertilizer nutrients. Grazing livestock increase options for crop diversity, such as crop rotations with perennial forages, increased use of cover crops and tree-crop associations. Further, as crop yields improve through application of sustainable intensification methods, greater amounts of above-ground residue become available for livestock nutrition, while greater quantities of below- and above-ground plant residues can be left to improve soil health than are currently returned to the soil. At the same time, in areas where extensive systems are still common, greater amounts of crop residue can be left for soil function because alternative feed sources are available. More research and education on proper integration of livestock in CA in the African context, and successful models of pastoralist-crop farmer collaboration are needed, so both livestock and soil needs can be met.
7
Xu, Yan, and Bingru Huang. "Metabolic Regulation of Cytokinins for Conferring Heat and Drought Tolerance in Perennial Grass Species." In Handbook of Plant and Crop Physiology, 557–66. 4th ed. 4th edition. | Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003093640-34.
Full text
8
Bohra, Pooja, Ajit Arun Waman, and Sanjay Mishra. "Crop Wild Relatives of Selected Perennial Horticultural Crops in Andaman and Nicobar Islands, India." In Conservation and Utilization of Horticultural Genetic Resources, 425–50. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3669-0_14.
Full text
9
Le Ber, Florence, Xavier Dolques, Laura Martin, Alain Mille, and Marc Benoît. "A Reasoning Model Based on Perennial Crop Allocation Cases and Rules." In Case-Based Reasoning Research and Development, 61–75. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61030-6_5.
Full text
10
Salgado, Sonia M. L., and Willian C. Terra. "The root-knot nematode: importance and impact on coffee in Brazil." In Integrated nematode management: state-of-the-art and visions for the future, 238–44. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789247541.0033.
Full textAbstract:
Abstract Coffee (Coffea spp.) is a crop of significant importance for Brazilian agribusiness, which in 2019 generated a gross revenue of US$3.73 billion. As a perennial crop, coffee stays in the field for many years, subjected to nematode parasitism from the seedling stage throughout the economic life of the plantation. In Brazil, it is a challenge for growers to produce coffee in the presence of the root-knot nematodes (RKN). Meloidogyne paranaensis and M. incognita are the most destructive species and their spread has expanded in recent years. This chapter discusses the economic importance, geographical distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of Meloidogyne paranaensis and M. incognita infesting coffee in Brazil.
Conference papers on the topic "Perennial crop"
1
Osiceanu, Marin. "BROADLEAVES PERENNIAL WEEDS CONTROL IN POTATO CROP." In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/3.2/s13.009.
Full text
2
Glubokovskih, Aleksandr. "Modes of agricultural use, productivity and fertility of developed lowland peat soils." In Multifunctional adaptive fodder production23 (71). ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-23-71-108-114.
Full textAbstract:
The results of many years of research on the cultivation of crops in fodder crop rotation on dried peat soil are presented. A productive and agroecological assessment of crop rotation with various saturation with perennial grasses is given. The data on the reduction of peat reserves and changes in the agrochemical properties of the soil are presented.
3
Mitchell, Rob. "Establishing and managing perennial grasses for bioenergy." In Proceedings of the 24th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2013. http://dx.doi.org/10.31274/icm-180809-114.
Full text
4
Liebman, Matt, Tim Youngquist, Ken Moore, and Jill Euken. "Nutrient management PLUS with perennial grass STRIPS." In Proceedings of the 24th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2014. http://dx.doi.org/10.31274/icm-180809-163.
Full text
5
Hart, Chad, and Jill Euken. "CenUSA: Results and resources for perennial grasses." In Proceedings of the 28th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2016. http://dx.doi.org/10.31274/icm-180809-201.
Full text
6
Hoque, Mainul, Georgeanne Artz, and Chad Hart. "Production cost budgets for perennial grass systems." In Proceedings of the 24th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2014. http://dx.doi.org/10.31274/icm-180809-139.
Full text
7
Cureton, Colin. "Supporting the commercialization, adoption, and scaling of climate-smart winter annual and perennial oilseeds." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/lyjl6277.
Full textAbstract:
The University of Minnesota Forever Green Initiative (FGI ) is an agricultural innovation platform developing viable, profitable perennial and winter annual crops and cropping systems that will provide “continuous living cover†on the Upper Midwestern agricultural landscape, which can likely improve climate mitigation and adaptation as well as provide other environmental co-benefits relative to conventional summer annual grain systems. Transdisciplinary FGI crop development research teams span genomics, plant breeding, agronomy, natural resource sciences, food science, social sciences, economics, and commercialization. Several of these crops include "cash cover crop" winter oilseeds such as winter camelina and pennycress, and perennial oilseeds such as perennial flax and silphium, which have diverse opportunities in oil markets. While developing the basic and applied science of these crops and cropping systems, FGI is supporting the commercialization, adoption, and scaling of FGI crops in partnership with researchers, growers, industry, policymakers, and communities. For example, early commercial winter camelina production (relay-cropping) and market interest is developing spanning fuel, feed, biopolymers, and food, largely in response to corporate commitments and consumer demand for sustainability, GHG reduction, climate change mitigation and adaptation, and supply chain resilience. Industry has an essential role to play in developing and scaling FGI crops by supporting basic research, contributing in-house expertise and facilities, and creating the market pull needed to move novel continuous living cover crops and cropping systems out onto the landscape and into the market.
8
SPIRIDONOV, Anatoliy. "Problems and prospects of alfalfa cultivation in the north-west of the Russian Federation." In Multifunctional adaptive fodder production 29 (77). ru: Federal Williams Research Center of Forage Production and Agroecology, 2022. http://dx.doi.org/10.33814/mak-2022-29-77-89-94.
Full textAbstract:
Alfalfa is the most widespread perennial legume forage crop in the world. Despite the obvious advantages of this crop, the expansion of production crops in the North-West of Russia is being held back for a number of reasons. Among the problems of cultivation, the main ones are the lack of seeds of zoned varieties and the non-compliance of soils with the requirements of culture. Prospects for the expansion of crops are seen in the breeding of plastic varieties and in the organization of their local seed production.
9
Kozlova, Zoya, Lyubov' Matais, and Ol'ga Glushkova. "Influence of sainfoin on soil fertility and agro-economic indicators of fodder crop rotations under conditions of East Siberia." In Multifunctional adaptive fodder production23 (71). ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-23-71-67-72.
Full textAbstract:
Under conditions of East Siberia, the positive effect of sainfoin on the fertility of gray forest soil and the introduction of this crop into fodder five-course rotations have been studied. In Siberia the Hungarian sainfoin (Onobrychis arenaria) is well-spread. As a control variant the crop rotation without perennial legume crops (sainfoin-free) was taken. Our research on the introduction of a new legume crop — sainfoin has shown that the content of mobile phosphorus, on the average in crop rotations, varies from 15.3 to 17.1 mg per 100 g of soil, the value of the nitrate nitrogen indicator — from 21.5 to 25.3 mg/kg. The intake of organic matter into the soil, due to a green manure — sainfoin — increases the humus content to 4.8–4.9 %. The rise in the yield of cultivated grain-forage crops after perennial legumes has been proved. Thus, the yield of pea-oats amounted 2.0–2.4 t/ha feed units. Among the crops harvested for green mass corn was more productive. It provided 1.8–2.2 t/ha of feed units. Pea-oats gave less productivity — from 1.5 t/ha of feed units in a control variant to 1.8 t/ha of feed units in the variants with sainfoin. The yielding capacity of sainfoin was 2.1–2.2 t/ha of feed units. The average yield for crop rotations with sainfoin was higher than the control by 16.6 %. Taking the obtained data into account, it may be concluded that all three five-course crop rotations are productive, the best, according to all criteria, is the variant with two fields of sainfoin providing the decline in cost price up to 3529.9 rub. one feed unit, the high level of pure income 11848 rub./ha and the biggest coefficient of energy efficiency — 3.0
10
Soroka, Andrey, Natal'ya Kostyuchenko, and Andrey Gaponyuk. "Productivity of perennial herbs on peat-mineral soils in the conditions of Polesie." In Multifunctional adaptive fodder production23 (71). ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-23-71-130-134.
Full textAbstract:
The results of studies on the productivity of perennial grasses on peat-mineral soil of Polesye are presented. Sowing alfalfa turned out to be the most productive crop among perennial leguminous herbs. Pasture legumes and grasses were slightly different in productivity. The introduction of an additional bean component in pasture mixtures did not contribute to a significant increase in the productivity of perennial herbs.
Reports on the topic "Perennial crop"
1
Moore, Gloria A., Gozal Ben-Hayyim, Charles L. Guy, and Doron Holland. Mapping Quantitative Trait Loci in the Woody Perennial Plant Genus Citrus. United States Department of Agriculture, May 1995. http://dx.doi.org/10.32747/1995.7570565.bard.
Full textAbstract:
As is true for all crops, production of Citrus fruit is limited by traits whose characteristics are the products of many genes (i.e. cold hardiness). In order to modify these traits by marker aided selection or molecular genetic techniques, it is first necessary to map the relevant genes. Mapping of quantitative trait loci (QTLs) in perennial plants has been extremely difficult, requiring large numbers of mature plants. Production of suitable mapping populations has been inhibited by aspects of reproductive biology (e.g. incompatibility, apomixis) and delayed by juvenility. New approaches promise to overcome some of these obstacles. The overall objective of this project was to determine whether QTLs for environmental stress tolerance could be effectively mapped in the perennial crop Citrus, using an extensive linkage map consisting of various types of molecular markers. Specific objectives were to: 1) Produce a highly saturated genetic linkage map of Citrus by continuing to place molecular markers of several types on the map. 2) Exploiting recently developed technology and already characterized parental types, determine whether QTLs governing cold acclimation can be mapped using very young seedling populations. 3) Determine whether the same strategy can be transferred to a different situation by mapping QTLs influencing Na+ and C1- exclusion (likely components of salinity tolerance) in the already characterized cross and in new alternative crosses. 4) Construct a YAC library of the citrus genome for future mapping and cloning.
2
Smith, Margaret, Nurit Katzir, Susan McCouch, and Yaakov Tadmor. Discovery and Transfer of Genes from Wild Zea Germplasm to Improve Grain Oil and Protein Composition of Temperate Maize. United States Department of Agriculture, 1998. http://dx.doi.org/10.32747/1998.7580683.bard.
Full textAbstract:
Project Objectives 1. Develop and amplify two interspecific populations (annual and perennial teosintes x elite maize inbred) as the basis for genetic analysis of grain quality. 2. Identify quantitative trait loci (QTLs) from teosinte that improve oil, protein, and essential amino acid composition of maize grain. 3. Develop near isogenic lines (NILs) to quantify QTL contributions to grain quality and as a resource for future breeding and gene cloning efforts. 4. Analyze the contribution of these QTLs to hybrid performance in both the US and Israel. 5. Measure the yield potential of improved grain quality hybrids. (NOTE: Yield potential could not be evaluated due to environmentally-caused failure of the breeding nursery where seed was produced for this evaluation.) Background: Maize is a significant agricultural commodity worldwide. As an open pollinated crop, variation within the species is large and, in most cases, sufficient to supply the demand for modem varieties and for new environments. In recent years there is a growing demand for maize varieties with special quality attributes. While domesticated sources of genetic variation for high oil and protein content are limited, useful alleles for these traits may remain in maize's wild relative, teosinte. We utilized advanced backcross (AB) analysis to search for QTLs contributing to oil and protein content from two teosinte accessions: Zea mays ssp. mexicana Race Chalco, an annual teosinte (referred to as Chalco), and Z diploperennis Race San Miguel, a perennial teosinte (referred to as Diplo). Major Conclusions and Achievements Two NILs targeting a Diplo introgression in bin 1.04 showed a significant increase in oil content in homozygous sib-pollinated seed when compared to sibbed seed of their counterpart non-introgressed controls. These BC4S2 NILs, referred to as D-RD29 and D-RD30, carry the Diplo allele in bin 1.04 and the introgression extends partially into bins 1.03 and 1.05. These NILs remain heterozygous in bins 4.01 and 8.02, but otherwise are homozygous for the recurrent parent (RD6502) alleles. NILs were developed also for the Chalco introgression in bin 1.04 but these do not show any improvement in oil content, suggesting that the Chalco alleles differ from the Diplo alleles in this region. Testcross Fl seed and sibbed grain from these Fl plants did not show any effect on oil content from this introgression, suggesting that it would need to be present in both parents of a maize hybrid to have an effect on oil content. Implications, both Scientific and Agricultural The Diplo region identified increases oil content by 12.5% (from 4.8% to 5.4% oil in the seed). Although this absolute difference is not large in agronomic terms, this locus could provide additive increases to oil content in combination with other maize-derived loci for high oil. To our knowledge, this is the first confirmed report of a QTL from teosinte for improved grain oil content in maize. It suggests that further research on grain quality alleles from maize wild relatives would be of both scientific and agricultural interest.
3
Smith, Margaret, Nurit Katzir, Susan McCouch, and Yaakov Tadmor. Discovery and Transfer of Genes from Wild Zea Germplasm to Improve Grain Oil and Protein Composition of Temperate Maize. United States Department of Agriculture, October 2002. http://dx.doi.org/10.32747/2002.7695846.bard.
Full textAbstract:
Project Objectives 1. Develop and amplify two interspecific populations (annual and perennial teosintes x elite maize inbred) as the basis for genetic analysis of grain quality. 2. Identify quantitative trait loci (QTLs) from teosinte that improve oil, protein, and essential amino acid composition of maize grain. 3. Develop near isogenic lines (NILs) to quantify QTL contributions to grain quality and as a resource for future breeding and gene cloning efforts. 4. Analyze the contribution of these QTLs to hybrid performance in both the US and Israel. 5. Measure the yield potential of improved grain quality hybrids. (NOTE: Yield potential could not be evaluated due to environmentally-caused failure of the breeding nursery where seed was produced for this evaluation.) Background: Maize is a significant agricultural commodity worldwide. As an open pollinated crop, variation within the species is large and, in most cases, sufficient to supply the demand for modem varieties and for new environments. In recent years there is a growing demand for maize varieties with special quality attributes. While domesticated sources of genetic variation for high oil and protein content are limited, useful alleles for these traits may remain in maize's wild relative, teosinte. We utilized advanced backcross (AB) analysis to search for QTLs contributing to oil and protein content from two teosinte accessions: Zea mays ssp. mexicana Race Chalco, an annual teosinte (referred to as Chalco), and Z diploperennis Race San Miguel, a perennial teosinte (referred to as Diplo). Major Conclusions and Achievements Two NILs targeting a Diplo introgression in bin 1.04 showed a significant increase in oil content in homozygous sib-pollinated seed when compared to sibbed seed of their counterpart non-introgressed controls. These BC4S2 NILs, referred to as D-RD29 and D-RD30, carry the Diplo allele in bin 1.04 and the introgression extends partially into bins 1.03 and 1.05. These NILs remain heterozygous in bins 4.01 and 8.02, but otherwise are homozygous for the recurrent parent (RD6502) alleles. NILs were developed also for the Chalco introgression in bin 1.04 but these do not show any improvement in oil content, suggesting that the Chalco alleles differ from the Diplo alleles in this region. Testcross Fl seed and sibbed grain from these Fl plants did not show any effect on oil content from this introgression, suggesting that it would need to be present in both parents of a maize hybrid to have an effect on oil content. Implications, both Scientific and Agricultural The Diplo region identified increases oil content by 12.5% (from 4.8% to 5.4% oil in the seed). Although this absolute difference is not large in agronomic terms, this locus could provide additive increases to oil content in combination with other maize-derived loci for high oil. To our knowledge, this is the first confirmed report of a QTL from teosinte for improved grain oil content in maize. It suggests that further research on grain quality alleles from maize wild relatives would be of both scientific and agricultural interest.
4
Norelli, John L., Moshe Flaishman, Herb Aldwinckle, and David Gidoni. Regulated expression of site-specific DNA recombination for precision genetic engineering of apple. United States Department of Agriculture, March 2005. http://dx.doi.org/10.32747/2005.7587214.bard.
Full textAbstract:
Objectives: The original objectives of this project were to: 1) evaluate inducible promoters for the expression of recombinase in apple (USDA-ARS); 2) develop alternative selectable markers for use in apple to facilitate the positive selection of gene excision by recombinase (Cornell University); 3) compare the activity of three different recombinase systems (Cre/lox, FLP/FRT, and R/RS)in apple using a rapid transient assay (ARO); and 4) evaluate the use of recombinase systems in apple using the best promoters, selectable markers and recombinase systems identified in 1, 2 and 3 above (Collaboratively). Objective 2 was revised from the development alternative selectable markers, to the development of a marker-free selection system for apple. This change in approach was taken due to the inefficiency of the alternative markers initially evaluated in apple, phosphomannose-isomerase and 2-deoxyglucose-6-phosphate phosphatase, and the regulatory advantages of a marker-free system. Objective 3 was revised to focus primarily on the FLP/FRT recombinase system, due to the initial success obtained with this recombinase system. Based upon cooperation between researchers (see Achievements below), research to evaluate the use of the FLP recombinase system under light-inducible expression in apple was then conducted at the ARO (Objective 4). Background: Genomic research and genetic engineering have tremendous potential to enhance crop performance, improve food quality and increase farm profits. However, implementing the knowledge of genomics through genetically engineered fruit crops has many hurdles to be overcome before it can become a reality in the orchard. Among the most important hurdles are consumer concerns regarding the safety of transgenics and the impact this may have on marketing. The goal of this project was to develop plant transformation technologies to mitigate these concerns. Major achievements: Our results indicate activity of the FLP\FRTsite-specific recombination system for the first time in apple, and additionally, we show light- inducible activation of the recombinase in trees. Initial selection of apple transformation events is conducted under dark conditions, and tissue cultures are then moved to light conditions to promote marker excision and plant development. As trees are perennial and - cross-fertilization is not practical, the light-induced FLP-mediated recombination approach shown here provides an alternative to previously reported chemically induced recombinase approaches. In addition, a method was developed to transform apple without the use of herbicide or antibiotic resistance marker genes (marker free). Both light and chemically inducible promoters were developed to allow controlled gene expression in fruit crops. Implications: The research supported by this grant has demonstrated the feasibility of "marker excision" and "marker free" transformation technologies in apple. The use of these safer technologies for the genetic enhancement of apple varieties and rootstocks for various traits will serve to mitigate many of the consumer and environmental concerns facing the commercialization of these improved varieties.
5
Rajarajan, Kunasekaran, Alka Bharati, Hirdayesh Anuragi, Arun Kumar Handa, Kishor Gaikwad, Nagendra Kumar Singh, Kamal Prasad Mohapatra, et al. Status of perennial tree germplasm resources in India and their utilization in the context of global genome sequencing efforts. World Agroforestry, 2020. http://dx.doi.org/10.5716/wp20050.pdf.
Full textAbstract:
Tree species are characterized by their perennial growth habit, woody morphology, long juvenile period phase, mostly outcrossing behaviour, highly heterozygosity genetic makeup, and relatively high genetic diversity. The economically important trees have been an integral part of the human life system due to their provision of timber, fruit, fodder, and medicinal and/or health benefits. Despite its widespread application in agriculture, industrial and medicinal values, the molecular aspects of key economic traits of many tree species remain largely unexplored. Over the past two decades, research on forest tree genomics has generally lagged behind that of other agronomic crops. Genomic research on trees is motivated by the need to support genetic improvement programmes mostly for food trees and timber, and develop diagnostic tools to assist in recommendation for optimum conservation, restoration and management of natural populations. Research on long-lived woody perennials is extending our molecular knowledge and understanding of complex life histories and adaptations to the environment, enriching a field that has traditionally drawn its biological inference from a few short-lived herbaceous species. These concerns have fostered research aimed at deciphering the genomic basis of complex traits that are related to the adaptive value of trees. This review summarizes the highlights of tree genomics and offers some priorities for accelerating progress in the next decade.
6
Eneroth, Hanna, Hanna Karlsson Potter, and Elin Röös. Environmental impact of coffee, tea and cocoa – data collection for a consumer guide for plant-based foods. Department of Energy and Technology, Swedish University of Agricultural Sciences, 2022. http://dx.doi.org/10.54612/a.2n3m2d2pjl.
Full textAbstract:
In 2020, WWF launched a consumer guide on plant-based products targeting Swedish consumers. The development of the guide is described in a journal paper (Karlsson Potter & Röös, 2021) and the environmental impact of different plant based foods was published in a report (Karlsson Potter, Lundmark, & Röös, 2020). This report was prepared for WWF Sweden to provide scientific background information for complementing the consumer guide with information on coffee, tea and cocoa. This report includes quantitative estimations for several environmental categories (climate, land use, biodiversity and water use) of coffee (per L), tea (per L) and cocoa powder (per kg), building on the previously established methodology for the consumer guide. In addition, scenarios of consumption of coffee, tea and cocoa drink with milk/plant-based drinks and waste at household level, are presented. Tea, coffee and cacao beans have a lot in common. They are tropical perennial crops traditionally grown in the shade among other species, i.e. in agroforestry systems. Today, the production in intensive monocultures has negative impact on biodiversity. Re-introducing agroforestry practices may be part of the solution to improve biodiversity in these landscapes. Climate change will likely, due to changes in temperature, extreme weather events and increases in pests and disease, alter the areas where these crops can be grown in the future. A relatively high ratio of the global land used for coffee, tea and cocoa is certified according to sustainability standards, compared to other crops. Although research on the implications of voluntary standards on different outcomes is inconclusive, the literature supports that certifications have a role in incentivizing more sustainable farming. Coffee, tea and cocoa all contain caffeine and have a high content of bioactive compounds such as antioxidants, and they have all been associated with positive health outcomes. While there is a strong coffee culture in Sweden and coffee contributes substantially to the environmental impact of our diet, tea is a less consumed beverage. Cocoa powder is consumed as a beverage, but substantial amounts of our cocoa consumption is in the form of chocolate. Roasted ground coffee on the Swedish market had a climate impact of 4.0 kg CO2e per kg powder, while the climate impact of instant coffee powder was 11.5 kg CO2e per kg. Per litre, including the energy use for making the coffee, the total climate impact was estimated to 0.25 kg CO2e per L brewed coffee and 0.16 kg CO2e per L for instant coffee. Less green coffee beans are needed to produce the same amount of ready to drink coffee from instant coffee than from brewed coffee. Tea had a climate impact of approximately 6.3 kg CO2 e per kg dry leaves corresponding to an impact of 0.064 CO2e per L ready to drink tea. In the assessment of climate impact per cup, tea had the lowest impact with 0.013 kg CO2e, followed by black instant coffee (0.024 kg CO2e), black coffee (0.038 kg CO2e), and cocoa drink made with milk (0.33 kg CO2e). The climate impact of 1kg cocoa powder on the Swedish market was estimated to 2.8 kg CO2e. Adding milk to coffee or tea increases the climate impact substantially. The literature describes a high proportion of the total climate impact of coffee from the consumer stage due to the electricity used by the coffee machine. However, with the Nordic low-carbon energy mix, the brewing and heating of water and milk contributes to only a minor part of the climate impact of coffee. As in previous research, coffee also had a higher land use, water use and biodiversity impact than tea per L beverage. Another factor of interest at the consumer stage is the waste of prepared coffee. Waste of prepared coffee contributes to climate impact through the additional production costs and electricity for preparation, even though the latter was small in our calculations. The waste of coffee and tea at Summary household level is extensive and measures to reduce the amount of wasted coffee and tea could reduce the environmental impact of Swedish hot drink consumption. For the final evaluation of coffee and tea for the consumer guide, the boundary for the fruit and vegetable group was used. The functional unit for coffee and tea was 1 L prepared beverage without any added milk or sweetener. In the guide, the final evaluation of conventionally grown coffee is that it is ‘yellow’ (‘Consume sometimes’), and for organic produce, ‘light green’ (‘Please consume). The evaluation of conventionally grown tea is that it is ‘light green’, and for organic produce, ‘dark green’ (‘Preferably consume this’). For cocoa, the functional unit is 1 kg of cocoa powder and the boundary was taken from the protein group. The final evaluation of conventionally grown cocoa is that it is ‘orange’ (‘Be careful’), and for organically produced cocoa, ‘light green’.
7
Climate Risks in the Northeast. USDA Northeast Climate Hub, 2017. http://dx.doi.org/10.32747/2017.6960277.ch.
Full textAbstract:
The 12 northeastern states form a diverse region producing more than $21 billion yearly in agricultural commodities. The Northeast region contains the seven most densely populated states and leads the nation in direct-to-public farm sales. Animal agriculture is important, particularly dairy and poultry. About half of the field crops and pasture grown in the Northeast are for animal feed. Horticulture and perennial fruits are also a relatively large portion of total plant production. Overall, farms in the Northeast are usually smaller in size and organic production is higher i comparison to other regions. About 21% of land in this region is farmland (6% of the national total), and 62% of land is classified as timberland.