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1
Berti, Antonio, Claudio Dunan, Maurizio Sattin, Giuseppe Zanin, and Philip Westra. "A New Approach To Determine When to Control Weeds." Weed Science 44, no. 3 (September 1996): 496–503. http://dx.doi.org/10.1017/s0043174500094248.
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A methodological approach to determine the optimum time to control weeds that integrates aspects of weed biology, weed-crop competition, and economics is presented. The approach is based on the concept of Time Density Equivalent: this is defined as the density of weed plants that germinate with the crop and compete until harvest that causes the same yield loss caused by a group of weeds with a given density, time of emergence, and time of removal. A model was developed that accounts for pattern of weed emergence and permits determination of timing of weed control that minimizes economic loss due to weeds emerging both before and after treatments. The outcomes of the model are presented with two examples: corn in competition with velvetleaf and soybean in competition withAmaranthus cruentus.For both crops, six different weed control strategies involving preemergence, chemical, and mechanical postemergence treatments are considered. The results obtained with the model are compared with the calculation of net margin based on assumptions of simultaneous emergence of crop and weeds and no effect of different times of control. Different control strategies are compared considering not only maximum net margin but also its dependence on time of control, because a strategy with a lower value of maximum net margin, but a flatter net margin curve, allows more flexibility of time of control.
2
Manzone, Marco, Mattia Demeneghi, Paolo Marucco, Marco Grella, and Paolo Balsari. "Technical solutions for under-row weed control in vineyards: Efficacy, costs and environmental aspects analysis." Journal of Agricultural Engineering 51, no. 1 (March 16, 2020): 36–42. http://dx.doi.org/10.4081/jae.2020.991.
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Weed control in vineyards is essential to allow optimal vines development. In this study, three different techniques (hoeing, chemical control, and mulching) used in vineyard’s under-row weed control were compared considering their: operative and economic aspects, energy consumptions and environmental impacts. Trials were performed in a vineyard located in Canelli (AT), Italy, characterized by 3 different gradient slopes (<5%, 10-15%, >20%). Each technique has been tested in 3 adjacent rows per each of the 3 vineyard slopes (randomized block test). Two weed control treatments were performed (at 50 days interval) during the peak vegetation growth period (from mid-April to mid-August). Major families of weeds in the test rows were described and scored (%), and weed control efficiency was measured by comparing the weeds cover area projected to the ground vs the test area. Results highlights that the use of mulching machine and the boom sprayer permits to maintain a weed coverage lower than 30% independently of slope gradient. The hoeing, characterized by low operational costs (26 € h–1) and energy requirement (550 MJ ha–1), scored acceptable working performances, but, in case of heavy rains, it can cause a runoff of the soil. The chemical weed control, also if results a valid choice in term of work quality, is not a valid solution from the environmental point of view. The mulching machine, although shows higher operating costs compared to other machines tested (30 € h–1), can be considered as the most viable alternative to chemical weed control because its working efficiency is comparable to that obtained by the sprayer.
3
Radosevich, Steven R., Claudio M. Ghersa, and Gary Comstock. "Concerns a Weed Scientist Might Have About Herbicide-Tolerant Crops." Weed Technology 6, no. 3 (September 1992): 635–39. http://dx.doi.org/10.1017/s0890037x00035946.
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There are three primary activities that characterize the discipline of Weed Science. These activities are weed technology, weed biology, and the ethics of weed control. Each of these activities needs to be considered as herbicide-tolerant crops (HTCs) are introduced. HTCs are the most recent refinement in the existing technology to control weeds. The potential benefits from the improved weed control must be weighed against possible increased costs of production and potential for genes that control herbicide tolerance to escape into non-tolerant plant populations. These questions about herbicide resistance are primarily technological and biological. They demonstrate the paucity of information in Weed Science on weed genetics, gene flow, fitness, and other aspects of weed-crop population dynamics. Other questions about HTCs are ethical. They require that we ask who benefits from the technology and what are the economic, ecological, and social consequences of it.
4
Nalewaja, John D. "Cultural Practices for Weed Resistance Management." Weed Technology 13, no. 3 (September 1999): 643–46. http://dx.doi.org/10.1017/s0890037x00046339.
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Cultural practices, such as delayed crop seeding, tillage, black fallow, crop rotation, hand weeding, and competitive crops, when used to replace herbicides, provide an opportunity to reduce the selection pressure that causes weeds to become resistant to herbicides. Herbicides on the other hand reduce the selection pressure that causes weeds to resist cultural practices. Rotation of the two systems should then delay resistance to both systems. Growers consider many factors in addition to weed resistance in selecting herbicide or cultural weed control, from associated convenience to economic potential. Rotation of different types of weed control practices would delay resistance, compared to a continuous single practice. The extent of the delay depends upon genetics of resistance, weed reproduction characteristics, weed seed survival, and fitness of resistant weed plants. An understanding of the basic aspects of weeds and herbicides, as well as their interaction with the environment, would help in predicting the delay in resistance to an herbicide from use of cultural practices in the rotation. A grower's final choice of a weed control practice will involve available equipment, time, markets, and soil erosion in addition to potential weed resistance. Weeds that develop resistance to a control practice still allow for reversion to preresistance practices, an important component of a grower's decision. The rate of resistance development is dependent upon the removal of susceptible genes from the population and fitness of the resistant plants. Resistance might be delayed for many years or be manageable when the resistance is genetically recessive or resistant weeds are poorly fit. Growers may not want to accept alternative cultural practices as long as there is the potential for development of another herbicide or reversion to cultural control after resistance occurs.
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Travlos, Montull, Kukorelli, Malidza, Dogan, Cheimona, Antonopoulos, Kanatas, Zannopoulos, and Peteinatos. "Key Aspects on the Biology, Ecology and Impacts of Johnsongrass [Sorghum halepense (L.) Pers] and the Role of Glyphosate and Non-Chemical Alternative Practices for the Management of This Weed in Europe." Agronomy 9, no. 11 (November 5, 2019): 717. http://dx.doi.org/10.3390/agronomy9110717.
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Sorghum halepense (L.) Pers is a common and noxious worldwide weed of increasing distribution in many European countries. In the present review, information on the biology, ecology, agricultural, economic and environmental impact of johnsongrass is given, and the current status of this weed in Europe is discussed. Furthermore, special attention is given to the important role of field trials using glyphosate to control weeds in arable and perennial crops in many European countries. Some of the factors which affect control efficacy and should be taken into account are also discussed. Finally, several non-chemical alternative methods (cultural, mechanical, thermal, biological, etc.) for johnsongrass management are also presented. The adoption of integrated weed management (IWM) techniques such as glyphosate use, crop rotation, and deep tillage is strongly recommended to control plant species that originate from both seed and rhizomes.
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Scavo, Aurelio, and Giovanni Mauromicale. "Integrated Weed Management in Herbaceous Field Crops." Agronomy 10, no. 4 (March 27, 2020): 466. http://dx.doi.org/10.3390/agronomy10040466.
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Current awareness about the environmental impact of intensive agriculture, mainly pesticides and herbicides, has driven the research community and the government institutions to program and develop new eco-friendly agronomic practices for pest control. In this scenario, integrated pest management and integrated weed management (IWM) have become mandatory. Weeds are commonly recognized as the most important biotic factor affecting crop production, especially in organic farming and low-input agriculture. In herbaceous field crops, comprising a wide diversity of plant species playing a significant economic importance, a compendium of the specific IWM systems is missing, that, on the contrary, have been developed for single species. The main goal of this review is to fill such gap by discussing the general principles and basic aspects of IWM to develop the most appropriate strategy for herbaceous field crops. In particular, a 4-step approach is proposed: (i) prevention, based on the management of the soil seedbank and the improvement of the crop competitiveness against weeds, (ii) weed mapping, aiming at knowing the biological and ecological characteristics of weeds present in the field, (iii) the decision-making process on the basis of the critical period of weed control and weed thresholds and iv) direct control (mechanical, physical, biological and chemical). Moreover, the last paragraph discusses and suggests possible integrations of allelopathic mechanisms in IWM systems.
7
J. Mason, T., W. M. Lonsdale, and K. French. "Environmental weed control policy in Australia: current approaches, policy limitations and future directions." Pacific Conservation Biology 11, no. 4 (2005): 233. http://dx.doi.org/10.1071/pc050233.
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Plant invasions of natural systems threaten biodiversity and ecosystem processes across many biomes. Historically most plant invasions have been facilitated by human activities such as industry, transport and landscape modification. Consequently, both causes and management of weed invasion are dependent on human behaviour and management advice provided by ecologists needs to take account of this fact. This paper assesses current environmental weed control policy in Australia and asks: are government, land managers and the scientific community using available social levers to achieve optimal weed management? We do this by comparing aspects of weed policy with a generalized natural resource policy framework. Adequacy of issue characterization and policy framing are discussed with particular reference to public perceptions of the weed problem, policy scaling and defining policy principles and goals. The implementation of policy Instruments, including regulation, VOluntary incentives, education, Information, motivational instruments, property-right instruments and pricing mechanisms are reviewed. Limitations of current instruments and potential options to improve instrument effectiveness are discussed. Funding arrangements for environmental weed control are also reported: environmental weed invasion generally represents an external cost to economic markets which has resulted in relatively low funding levels for control operations. Finally, review and monitoring procedures in weed programmes and policy are addressed. Rigorous monitoring systems are important in effective, adaptive weed management where control techniques are continually refined to improve ecological outcomes. The utility of maintaining links between project outcomes and policy inputs along with methods of implementing appropriate monitoring are discussed.
8
Ervin, David, and Ray Jussaume. "Integrating Social Science into Managing Herbicide-Resistant Weeds and Associated Environmental Impacts." Weed Science 62, no. 2 (June 2014): 403–14. http://dx.doi.org/10.1614/ws-d-13-00085.1.
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Controlling herbicide resistance (HR) and its associated environmental risks is impossible without integrating social and economic science with biophysical and technology aspects. Herbicide resistance is a dynamically complex and ill-structured problem involving coupled natural–human systems that defy management approaches based on simple scientific and technology applications. The existence of mobile herbicide resistance and/or herbicide tolerance traits add complexity because susceptibility to the herbicide is a resource open to all farmers, impacting the weed population. Weed scientists have extensively researched the biophysical aspects and grower perceptions of HR. They also recognize that the “tragedy of the commons” can appear when herbicide resistance is mobile across farms. However, the human structures and processes, especially private and public institutions that influence individual and group decisions about HR, have received little analysis. To start filling that gap, we discuss an integrative management approach to sustainable weed control that addresses the social complexity of farm heterogeneity. For example, the need for a private or public collective mechanism becomes apparent to address common-pool resource (CPR) aspects when one farmer's weed control actions influence their neighbors' situations. In such conditions, sole reliance on education, technical assistance, and other incentives aimed at changing individual grower behavior likely will fail to stem the advance of HR. Social science theories can be used to enrich the understanding of human interaction with the biophysical environment and identify key actors and social change processes influencing those interactions in the case of HR. The short-run economic advantages of herbicides such as glyphosate work against social change to address HR, including the development of collective actions when mobile HR conditions exist. We discuss seven design principles that can improve the efficacy and cost of such collective approaches and draw insights from CPR approaches outside of HR.
9
Kniss, Andrew R., Robert G. Wilson, Alex R. Martin, Paul A. Burgener, and Dillon M. Feuz. "Economic Evaluation of Glyphosate-Resistant and Conventional Sugar Beet." Weed Technology 18, no. 2 (June 2004): 388–96. http://dx.doi.org/10.1614/wt-03-119r.
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Field experiments were conducted near Scottsbluff, NE, in 2001 and 2002 to compare economic aspects of glyphosate applied to different glyphosate-resistant sugar beet cultivars with that of conventional herbicide programs applied to near-equivalent, non–glyphosate-resistant conventional cultivars. Glyphosate applied two or three times at 2-wk intervals, beginning when weeds were 10 cm tall, provided excellent weed control, yield, and net economic return regardless of the glyphosate-resistant sugar beet cultivar. All conventional herbicide treatments resulted in similar net economic returns. Although the conventional sugar beet cultivars ‘HM 1640’ and ‘Beta 4546’ responded similarly to herbicide treatments with respect to sucrose content, ‘Beta 4546RR’ produced roots with 1% more sucrose than ‘HM 1640RR’. When averaged over herbicide treatments, a producer planting Beta 4546RR could afford to pay US $185/ha more for glyphosate-resistant technology as could a producer planting HM 1640RR. When averaged over cultivars and herbicide treatments, it is estimated that a producer could afford to pay an additional US $385/ha for glyphosate-resistant technology without decreasing net return.
10
Shulner, Itai, Evyatar Asaf, Zohar Ben-Simhon, Miri Cohen-Zinder, Ariel Shabtay, Zvi Peleg, and Ran Nisim Lati. "Optimizing Weed Management for the New Super-Forage Moringa oleifera." Agronomy 11, no. 6 (May 24, 2021): 1055. http://dx.doi.org/10.3390/agronomy11061055.
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Moringa oleifera Lam. (moringa hereafter) is cultivated as a new summer super-forage field crop in Israel, yet no weed control protocol has been developed for it. The objective of the study was to develop an integrated weed management (IWM) practice for the moringa agro-system in arid and semi-arid regions like the Mediterranean basin. We tested various herbicides applied pre (PRE) and post (POST) crop emergence and cultivation methods for weed control, with an emphasis on crop safety. The PRE herbicides were the most effective and safe control mean. Their application resulted in minor (<5%) crop fresh weight reductions and weed cover area, compared with the control. The POST herbicides were also effective, yet their crop safety level was lower and non-consistent in some treatments. Generally, the finger weeder was less effective than the herbicide treatments and caused higher fresh weight reduction. However, this means was more effective when applied at earlier stages. Management and environmental conditions had a high impact on the moringa growth; hence, these aspects should be considered. Our results show the potential use of different herbicides and non-chemical tools and set the basis for a future IWM protocol for moringa. The wide range of options offered here can ensure economic and environmentally viable solutions for this new crop.
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Somerville, Gayle J., Mette Sønderskov, Solvejg Kopp Mathiassen, and Helen Metcalfe. "Spatial Modelling of Within-Field Weed Populations; a Review." Agronomy 10, no. 7 (July 20, 2020): 1044. http://dx.doi.org/10.3390/agronomy10071044.
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Concerns around herbicide resistance, human risk, and the environmental impacts of current weed control strategies have led to an increasing demand for alternative weed management methods. Many new weed management strategies are under development; however, the poor availability of accurate weed maps, and a lack of confidence in the outcomes of alternative weed management strategies, has hindered their adoption. Developments in field sampling and processing, combined with spatial modelling, can support the implementation and assessment of new and more integrated weed management strategies. Our review focuses on the biological and mathematical aspects of assembling within-field weed models. We describe both static and spatio-temporal models of within-field weed distributions (including both cellular automata (CA) and non-CA models), discussing issues surrounding the spatial processes of weed dispersal and competition and the environmental and anthropogenic processes that affect weed spatial and spatio-temporal distributions. We also examine issues surrounding model uncertainty. By reviewing the current state-of-the-art in both static and temporally dynamic weed spatial modelling we highlight some of the strengths and weaknesses of current techniques, together with current and emerging areas of interest for the application of spatial models, including targeted weed treatments, economic analysis, herbicide resistance and integrated weed management, the dispersal of biocontrol agents, and invasive weed species.
12
Stejskal, V. "A new concept of economic injury level that includes penalization of damage to quality and safety of agricultural products." Plant Protection Science 37, No. 4 (January 1, 2001): 151–56. http://dx.doi.org/10.17221/8380-pps.
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The traditional model of Economic Injury Level (EIL) does not allow to directly incorporate aspects of damage to quality and safety of a product (Dq) into the decision-making process to control a pest (pathogen, weed, arthropod, vertebrate). This work now attempts to generalize a concept of EIL by (i) separating damages to quality and safety (i.e. Dq and EILq) from quantitative (i.e. Dw and EILw) types of damage (D) in the traditional EIL-equation, and (ii) by establishing a new way of estimation of EILq based on the penalization of quality and/or safety damage. The importance to distinguish between the terms EIL, EILw and EILq is discussed, and a calculation of the new index (Z), enabling the comparison of the relative economic importance of qualitative and quantitative damage caused by a particular level of pest infestation or disease severity, is proposed.
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Markus Rawung, Jefny B., and Rita Indrasti. "The Constraints to Sago Development and Improvement Efforts in Siau Tagulandang Biaro (Sitaro) Islands." E3S Web of Conferences 232 (2021): 01029. http://dx.doi.org/10.1051/e3sconf/202123201029.
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Sago (Metroxylon sago Rottb) is very suitable as a food ingredient because it contains carbohydrates in starch form and high calories. In eastern Indonesia, the sago plant has important social, economic, and ecological roles for most societies because it is also used as a staple food. On the contrary, its development still requires powerful and maximum support. This study aims to describe the diversity of cultivation technology applications and the constraints of sago development. The research was carried out in a plantation area in the Siau Tagulandang Biaro (Sitaro) Islands Regency, North Sulawesi Province, from June to December 2016. The research used a survey method with semi-structured interview techniques on 60 respondents and focus group discussion (FGD) techniques. The research results that have been carried out indicate that farmers have not fully implemented good sago cultivation technology. However, they understand the economic value of this plant. The components of cultivation that were still weak were the weed control aspects and pest and disease control, as well as the post-harvest aspects in terms of sago pith processing techniques.
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Stevens, Matthew D., Brent L. Black, John D. Lea-Cox, and Dillon Feuz. "Horticultural and Economic Considerations in the Sustainability of Three Cold-climate Strawberry Production Systems." HortScience 46, no. 3 (March 2011): 445–51. http://dx.doi.org/10.21273/hortsci.46.3.445.
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Three cold-climate strawberry (Fragaria ×ananassa) production systems, conventional matted row (CMR), advanced matted row (AMR), and cold-climate plasticulture (CCP), were compared for horticultural and economic aspects of sustainability over a 3-year planting cycle. The systems were tested using a single cultivar, Allstar, to avoid treatment × cultivar interaction. System-specific management operations and materials affected the total production costs of each system. Both CMR and AMR had higher management costs than CCP as a result of labor costs for weed control, but CCP had much higher cost of materials. Overall expenses were lowest for CMR and highest for AMR. Yields in the first fruiting year were highest for CMR at 17.4 Mg·ha−1 followed by AMR and CCP at 13.2 Mg·ha−1 and 11.8 Mg·ha−1, respectively. In the 2004 harvest season, CMR and AMR were the highest yielding at 10.0 Mg·ha−1 and 9.0 Mg·ha−1, respectively, with CCP the lowest yielding at 6.0 Mg·ha−1. Low yield and fruit size in the second year and high material costs for establishment limit the economic viability for CCP when managed as a perennial system.
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Pawłowski, Krzysztof Piotr. "REGULATION OF WEEDS AS A FACTOR AFFECTING THE PROFITABILITY OF NARROW-LEAFED LUPINE PRODUCTION." Annals of the Polish Association of Agricultural and Agribusiness Economists XX, no. 6 (December 10, 2018): 205–11. http://dx.doi.org/10.5604/01.3001.0012.7762.
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The purpose of the article is to determine the economic effectiveness of herbicidal treatments used in the cultivation of narrow-leafed lupine in the aspect of the profitability of its production. The domestic production of leguminous plants in only 30% covers the need for protein needed for the production of feed. In this way, Poland is conditioned on the import of soybean meal, which has a negative impact on its food security. Narrow-leaved Lupine is one of the basic species of legumes which are grown in Poland. Nevertheless, relatively few farmers decide to grow it due to low profitability, which is primarily related to the lack of optimal methods of weed control. The research was carried out on the basis of a field experiment in a randomized block arrangement. On the basis of the results obtained, the direct surplus resulting from the use of individual herbicides was determined, which was positive for all combinations. A negative, strong correlation between the number and fresh weight of weeds and the obtained yield was also found. In addition, a model was created to determine the level of yield depending on the condition and degree of weed infestation.
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Sivcev, Branislava, Ivan Sivcev, and Zorica Rankovic-Vasic. "Natural process and use of natural matters in organic viticulture." Journal of Agricultural Sciences, Belgrade 55, no. 2 (2010): 195–215. http://dx.doi.org/10.2298/jas1002195s.
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During recent years organic viticulture has been developing in the leading viticulture countries worldwide. The organic viticulture has been defined as the application of procedures of organic agriculture in view of increasing the production of top quality grape and wine. All the aspects of the organic viticulture such as cultivating and maintaining the soil, ground cover plants and weed control, balanced nutrition of grapevine, growing systems, disease and pest control are carried out in view of increasing the quality and health safety of wine and table varieties. When making a choice of a cultivar, there are two key factors: an economic indicator-market perspective and characteristics of a cultivar. Traditional varieties are in advantage in comparison to newly created ones, new preparations, improved computerised forecast models contribute to the efficient protection from disease and pests. New I.C./PIWI varieties must show tolerance to low winter temperatures and/or spring frosts, real commercial value through the quality of fruit, wine, juice or table grapes, tolerance to diseases and pests, balanced relationship between fruit and wood ripening. The aim of this paper is to present organic viticulture through integral agroecosystem and traditionally applied procedures in viticulture.
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Price, TP, F. O'Gara, ESC Smith, R. Pitkethley, and P. Hausler. "Commercial experience in developing ley farming systems for the Katherine-Darwin region, Northern Territory." Australian Journal of Experimental Agriculture 36, no. 8 (1996): 1059. http://dx.doi.org/10.1071/ea9961059.
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This paper examines the past, present and likely future commercial development and adoption of ley farming systems in the Katherine-Darwin region(about 12-14�S, 131-132�E, elevation 30-1 10 m) of the Northern Territory. Producers' current practices, adaptations and the extent to which they have adopted a systems approach are reported. Advantages of ley farming and the constraints to its more rapid adoption are described. Also discussed are aspects of crop, cattle and hay production; weed, insect and plant disease control, and management; on-farm demonstrations and the economics of crop production, from the producer's perspective, in the context of ley farming.
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Oliveira, Nerea, César Pérez-Cruzado, Isabel Cañellas, Roque Rodríguez-Soalleiro, and Hortensia Sixto. "Poplar Short Rotation Coppice Plantations under Mediterranean Conditions: The Case of Spain." Forests 11, no. 12 (December 17, 2020): 1352. http://dx.doi.org/10.3390/f11121352.
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Developing a circular bioeconomy based on the sustainable use of biological resources, such as biomass, seems to be the best way of responding to the challenges associated with global change. Among the many sources, short rotation forest crops are an essential instrument for obtaining quality biomass with a predictable periodicity and yield, according to the areas of cultivation. This review aims to provide an overview of available knowledge on short rotation coppice Populus spp. plantations under Mediterranean conditions and specifically in Spain, in order to identify not only the status, but also the future prospects, for this type of biomass production. The analysis of available information was conducted by taking into consideration the following aspects: Genetic plant material; plantation design, including densities, rotation lengths and the number of rotations, and mixtures; management activities, including irrigation, fertilization, and weed control; yield prediction; biomass characterization; and finally, an evaluation of the sustainability of the plantation and ecosystem services provided. Despite advances, there is still much to be done if these plantations are to become a commercial reality in some Mediterranean areas. To achieve this aim, different aspects need to be reconsidered, such as irrigation, bearing in mind that water restrictions represent a real threat; the specific adaptation of genetic material to these conditions, in order to obtain a greater efficiency in resource use, as well as a greater resistance to pests and diseases or tolerance to abiotic stresses such as drought and salinity; rationalizing fertilization; quantifying and valuing the ecosystem services; the advance of more reliable predictive models based on ecophysiology; the specific characterization of biomass for its final use (bioenergy/bioproducts); technological improvements in management and harvesting; and finally, improving the critical aspects detected in environmental, energy, and economic analyses to achieve profitable and sustainable plantations under Mediterranean conditions.
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Kharrich, Mohammed, Salah Kamel, Rachid Ellaia, Mohammed Akherraz, Ali S. Alghamdi, Mamdouh Abdel-Akher, Ahmad Eid, and Mohamed I. Mosaad. "Economic and Ecological Design of Hybrid Renewable Energy Systems Based on a Developed IWO/BSA Algorithm." Electronics 10, no. 6 (March 15, 2021): 687. http://dx.doi.org/10.3390/electronics10060687.
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In this paper, an optimal design of a microgrid including four houses in Dakhla city (Morocco) is proposed. To make this study comprehensive and applicable to any hybrid system, each house has a different configuration of renewable energies. The configurations of these four houses are PV/wind turbine (WT)/biomass/battery, PV/biomass, PV/diesel/battery, and WT/diesel/battery systems. The comparison factor among these configurations is the cost of energy (COE), comparative index, where the load is different in the four houses. Otherwise, the main objective function is the minimization of the net present cost (NPC), subject to several operating constraints, the power loss, the power generated by the renewable sources (renewable fraction), and the availability. This objective function is achieved using a developed optimization algorithm. The main contribution of this paper is to propose and apply a new optimization technique for the optimal design of a microgrid considering different economic and ecological aspects. The developed optimization algorithm is based on the hybridization of two metaheuristic algorithms, the invasive weed optimization (IWO) and backtracking search algorithm (BSA), with the aim of collecting the advantages of both. The proposed hybrid optimization algorithm (IWO/BSA) is compared with the original two optimization methods (IWO and BSA) as well as other well-known optimization methods. The results indicate that PV/biomass and PV/diesel/battery systems have the best energy cost using the proposed IWO/BSA algorithm with 0.1184 $/kWh and 0.1354 $/kWh, respectively. The best system based on its LCOE factor is the PV/biomass which represents an NPC of 124,689 $, the size of this system is 349.55 m2 of PV area and the capacity of the biomass is 18.99 ton/year. The PV/diesel/battery option has also good results, with a system NPC of 142,233 $, the size of this system is about 391.39 m2 of PV area, rated power of diesel generator about 0.55 kW, and a battery capacity of 12.97 kWh. Otherwise, the proposed IWO/BSA has the best convergence in all cases. It is observed that the wind turbine generates more dumped power, and the PV system is highly suitable for the studied area.
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HEIKKILÄ, J. "A review of risk prioritisation schemes of pathogens, pests and weeds: principles and practices." Agricultural and Food Science 20, no. 1 (December 4, 2008): 15. http://dx.doi.org/10.2137/145960611795163088.
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Societys resources are scarce, and biosecurity actions need to be targeted and prioritised. Various models have been developed that prioritise and rank pests and diseases according to the risks they represent. A prioritisation model allows utilisation of scientific, ecological and economic information in decision-making related to biological hazards. This study discusses such models and the properties associated with them based on a review of 78 prioritisation studies. The scope of the models includes all aspects of biosecurity (human, animal and plant diseases, and invasive alien species), but with an emphasis on plant health. The geographical locations of the studies are primarily North America, Europe, Australia and New Zealand. Half of the studies were conducted during the past five years. The review finds that there generally seems to be several prioritisation models, especially in the case of invasive plants, but only a select few models are used extensively. Impacts are often accounted for in the model, but the extent and economic sophistication of their inclusion varies. Treatment of uncertainty and feasibility of control was lacking from many studies.;
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Yusuf, Shehu Folaranmi Gbolahan, Oluwabunmi Oluwaseun Popoola, Lindokhule Gwala, and Thinandavha Nesengani. "Promoting University–Community Alliances in the Experiential Learning Activities of Agricultural Extension Postgraduate Students at the University of Fort Hare, South Africa." Sustainability 13, no. 18 (September 18, 2021): 10411. http://dx.doi.org/10.3390/su131810411.
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This study examines the university–community alliance with regard to experiential learning activities that may be used to enhance the competencies of agricultural extension postgraduate students (AEPS). Through research and alliance, university education provides agricultural extension students with ideal learning spaces to explore cause-related social, economic, and sustainability aspects of agriculture. The objectives of the study were for the AEPS to work on community farms for between six to eight weeks, to identify production challenges, and to attempt to solve problems using a participatory action research (PAR) approach. Students collected data daily, using parameters that included types of agro-enterprise, agricultural practices, observation and control of pests and diseases, identification, and control of weed infestation types, control of predators, and management of various security challenges. Social media were also used to share posts (pictures and videos) of the various project activities with the public for discussion and knowledge sharing. Findings show that there was an improved relationship between the students and their community collaborators. All participants mutually benefited from the programme; students gained indigenous farming knowledge from the farmers, while farmers benefited from the scientific approaches to solving common farming problems employed by the students—mostly improvised technologies with local content. Both the students and the farmers learned from the knowledge shared by various followers on Facebook, who gave suggestions to address some of the challenges posted on social media. The programme advocates the need to shift from a mostly rigid, conventional curriculum to a more dynamic, interactive one, which embraces active experimentation with theoretical knowledge. It underscores the significance of experiential learning for developing students’ technical competencies. The success of the programme could influence curriculum development and re-design to accommodate more experience-based modules.
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Bulíř, P. "Growth of Austrian pine (Pinus nigra Arnold) treated with soil conditioners on Loket spoil bank." Journal of Forest Science 52, No. 12 (January 9, 2012): 556–64. http://dx.doi.org/10.17221/4536-jfs.
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The effects of soil conditioners Frisol, TerraCottem, Bi-algeen, and fertilisers Silvamix Forte and Cererit on the welfare of Austrian pine were observed in a seven-year experiment on Loket spoil bank. Simultaneously the economic aspects of growing the Austrian pine until the stage of established plantation were examined. The application of products one year and a half after planting did not cause seedling mortality. The elongation growth of young plants conditioned by the application of Silvamix Forte and Frisol was statistically significant whereas these effects manifested themselves in the second year: they persisted till the end of the experiment for Silvamix Forte, and for three years in total for Frisol. The other products – TerraCottem, Bi-algeen and Cererit – also showed generally better, though statistically insignificant results as compared to those of the control plants. The elongation growth for all products culminated in the fifth year and then declined. The stem diameter growth for the best products reached its maximum in the second year. Regarding the overall height growth after seven years, the average number of the highest plants on the experiment location was on plots treated with Silvamix Forte; these plants exceeded the control plants by 46.2 cm. Pines treated with Frisol were higher by 23.4 cm. However, the application of soil conditioners and fertilisers to the given location proved economically ineffective because there was no need to improve the soil at the location, the same applies to mowing and hoeing since almost no forest weed grew there and the substrate surface remained well-aerated and porous.
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Lance, N. J., S. W. Breck, C. Sime, P. Callahan, and J. A. Shivik. "Biological, technical, and social aspects of applying electrified fladry for livestock protection from wolves (Canis lupus)." Wildlife Research 37, no. 8 (2010): 708. http://dx.doi.org/10.1071/wr10022.
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Context. Wolf predation on livestock can cause economic hardship for livestock producers as well as reduce tolerance for wolves. Lethal control of wolves is often controversial; thus, development of effective non-lethal methods for reducing wolf–livestock conflict is important. Electrified fladry is a new tool that is similar to fladry (i.e. a barrier system that scares wolves), but electrified fladry also incorporates an electric shock designed to decrease the potential for wolves to habituate to the barriers. Aim. Evaluation of electrified fladry requires understanding of its effectiveness relative to fladry and the costs and benefits of applying it in the field. Methods. By using captive wolves, we compared the effectiveness of electrified fladry v. fladry for protecting a food resource during 2-week trials. We then performed a field trial with electrified fladry for managing wolves in Montana, USA. We measured livestock depredation and wolf activity on six treatment and six control pastures, calculated the cost of installation and maintenance, and surveyed all study participants about application of electrified fladry. Key results. We found electrified fladry 2–10 times more effective than fladry at protecting food in captivity and that hunger increased the likelihood of wolves testing fladry barriers. In field trials, we installed 14.0 km of EF systems in treatment pastures and detected wolves twice in control pastures but never in the treatment pastures. No livestock were killed by wolves in treatment or control pastures. A completed electrified fladry system cost $2303 for the first km and $2032 for each additional km, and required 31.8 person-hours per kilometre to install. We observed 18 failures (i.e. electrified system stopped working) during a total of 394 days of use. In total, 83% of ranchers who used fladry would continue to use it under certain conditions, indicating some psychological benefit to users. Conclusions and implications. The present study has demonstrated that electrified fladry offers superior protection compared with non-electrified fladry; however, further field tests are warranted to help determine whether benefits outweigh costs.
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Thornton, P. K., R. H. Fawcett, J. B. Dent, and T. J. Perkins. "Spatial weed distribution and economic thresholds for weed control." Crop Protection 9, no. 5 (October 1990): 337–42. http://dx.doi.org/10.1016/0261-2194(90)90003-p.
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Hester, Susan M., Oscar J. Cacho, F. Dane Panetta, and Cindy E. Hauser. "Economic aspects of post-border weed risk management." Diversity and Distributions 19, no. 5-6 (May 2013): 580–89. http://dx.doi.org/10.1111/ddi.12053.
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Cox, K. D., and H. Scherm. "Effect of Desiccants and Herbicides on Germination of Pseudosclerotia and Development of Apothecia of Monilinia vaccinii-corymbosi." Plant Disease 85, no. 4 (April 2001): 436–41. http://dx.doi.org/10.1094/pdis.2001.85.4.436.
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Pseudosclerotia (infected, mummified fruit) are the only source of primary inoculum of Monilinia vaccinii-corymbosi, the causal agent of mummy berry disease of blueberry. Laboratory applications of potential inhibitors of carpogenic germination were made to pseudosclerotia at three distinct developmental stages, i.e., ungerminated pseudosclerotia, pseudosclerotia with emerging stipes, and those with mature apothecia. Potential inhibitors evaluated included soybean oil and ammonium thiosulfate (two desiccants used experimentally as bloom thinners in fruit crops) and diuron and simazine (two commonly used herbicides), each applied in an aqueous suspension with 3% Latron B-1956 surfactant. Various aspects of carpogenic germination including the percentage of pseudosclerotia that produced stipes or apothecia, the number of stipes or apothecia per pseudosclerotium, the percentage of stipes that developed into apothecia, longevity of stipes and apothecia, and ascospore numbers were assessed. Compared with water, application of ammonium thiosulfate (2%) and diuron (2%) reduced stipe and apothecium production when sprayed on ungerminated pseudosclerotia, but these reductions were generally not significantly different from those achieved with Latron B applied alone (P > 0.05). The two compounds, however, completely inhibited the development of stipes into apothecia when applied to pseudosclerotia with stipes and caused a >3-fold reduction in apothecium longevity when applied to pseudosclerotia with mature apothecia. Application of simazine (2%) before germination or at stipe emergence resulted in the development of malformed apothecia from which no ascospores were recovered; stipe and apothecium longevity were also reduced. Soybean oil (15%) and Latron B applied alone had weak or inconsistent effects on most aspects of carpogenic germination of pseudosclerotia, although both compounds, when applied at stipe emergence, significantly reduced ascospore numbers in subsequently formed apothecia. The results suggest that diuron and simazine applied for weed control in commercial blueberry plantings may have beneficial side effects in reducing carpogenic germination of pseudosclerotia. The strong inhibitory effect of ammonium thiosulfate on all aspects of carpogenic germination, along with its value as a nitrogen fertilizer and ancillary herbicide, warrants further evaluation of this compound's performance and economics in the field.
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Ethridge, Don E., R. Terry Ervin, Clay M. Hamilton, J. Wayne Keeling, and John R. Abernathy. "Economic Weed Control in High Plains Cotton." Journal of Production Agriculture 3, no. 2 (April 1990): 246–52. http://dx.doi.org/10.2134/jpa1990.246.
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Mihaylova, Anna, Petya Kasnakova, Stanislav Gueorguiev, Elina Petkova-Gueorguieva, and Lili Peikova. "Cost analysis of neonates after prenatal corticosteroid prophylaxis of Respiratory Distress Syndrome." Pharmacia 67, no. 4 (October 2, 2020): 209–14. http://dx.doi.org/10.3897/pharmacia.67.e50458.
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Preterm birth is a vital global health-economic problem. Health disorders provoked by it generate a high neonatal mortality rate. Prenatal corticosteroid prevention aims to reduce postnatal complications in premature infants. This survey covered two basic baby groups: work group of 89 premature infants that had been subjected to prenatal corticosteroid prophylaxis and a control group of 78 premature babies without prenatal prevention. The analysis of the pharmacoeconomic aspects of prenatal corticosteroid prevention enabled the comparison of clinical and therapeutic results, treatment costs, therapeutic expenditures, shortterm therapeutic effect, benefits and sequences from premature infants’ therapy. The analysis of clinical data obtained during this survey enabled the conclusion that when analyzing the combined effect of Dexamethasone prophylaxis, gestation week at birth and the age of the mother of premature infants with RDS, respiratory obstuction occurrence was mediated by the earlier gestation week at birth, older mother’s age and, at this background, it was restricted to a certain extent by prenatal corticosteroid administration. Conclusions: Prenatal corticosteroids cause reduction of premature infants’ treatment costs. The implementation of a smaller number of dexamethasone applications leads to smaller expenditures for premature infants’ treatment and care compared to those that have more dexamethasone applications.
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Puvača, Nikola, Ivana Brkić, Miralem Jahić, Svetlana Roljević Nikolić, Gordana Radović, Dragan Ivanišević, Milorad Đokić, et al. "The Effect of Using Natural or Biotic Dietary Supplements in Poultry Nutrition on the Effectiveness of Meat Production." Sustainability 12, no. 11 (May 26, 2020): 4373. http://dx.doi.org/10.3390/su12114373.
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The goal of the research was to investigate the effect of dietary natural or biotic additives such as garlic, black pepper, and chili pepper powder in poultry nutrition on sustainable and economic efficiency of this type of production. A total of eight dietary treatments with 1200 broiler chickens of hybrid line Hubbard were formed, with four replicates. During the experimental period, chickens were fed with three period mixtures diets of different average costs: Starter compound mixture two weeks (0.38 €/kg in all treatments), grower compound mixture next three weeks (0.36, 0.38, 0.40, 0.41, 0.46, 0.39, 0.42, and 0.39 €/kg, respectively), and finisher compound mixture for the final week (0.34, 0.36, 0.38, 0.39, 0.44, 0.37, 0.40, and 0.37 €/kg, respectively). The experiment lasted a total of 42 days. Upon finishing the experiment, results have shown statistically significant (p < 0.05) differences regarding the European broiler index (EBI) as one of the indicators of economic efficacy. The EBI was lowest in the control treatment (220.4) and significantly higher in experimental treatments (298.6), respectively. In cost, a calculation included the cost of feed and used natural or biotic supplements in chicken nutrition. The findings of the study of economic efficiency revealed that the cost per treatment rises depends on the natural additive used. Economic efficiency analysis showed that the most economical natural additive with the lowest cost is garlic (0.68 €/kg), while the most uneconomical is treatment with black pepper with the highest cost of body weight gain (0.82 €/kg). This higher cost of the gained meat is minimal as a consequence of a much healthier and more nutritious food meant for human use, which often promotes sustainable aspects, compared to conventional and industrialized poultry production.
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Anwar, M. P., A. S. Juraimi, B. Samedani, A. Puteh, and A. Man. "Critical Period of Weed Control in Aerobic Rice." Scientific World Journal 2012 (2012): 1–10. http://dx.doi.org/10.1100/2012/603043.
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Critical period of weed control is the foundation of integrated weed management and, hence, can be considered the first step to design weed control strategy. To determine critical period of weed control of aerobic rice, field trials were conducted during 2010/2011 at Universiti Putra Malaysia. A quantitative series of treatments comprising two components, (a) increasing duration of weed interference and (b) increasing length of weed-free period, were imposed. Critical period was determined through Logistic and Gompertz equations. Critical period varied between seasons; in main season, it started earlier and lasted longer, as compared to off-season. The onset of the critical period was found relatively stable between seasons, while the end was more variable. Critical period was determined as 7–49 days after seeding in off-season and 7–53 days in main season to achieve 95% of weed-free yield, and 23–40 days in off-season and 21–43 days in main season to achieve 90% of weed-free yield. Since 5% yield loss level is not practical from economic view point, a 10% yield loss may be considered excellent from economic view point. Therefore, aerobic rice should be kept weed-free during 21–43 days for better yield and higher economic return.
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Tharp, Brent E., James J. Kells, Thomas T. Bauman, R. Gordon Harvey, William G. Johnson, Mark M. Loux, Alex R. Martin, et al. "Assessment of Weed Control Strategies for Corn in the North-Central United States." Weed Technology 18, no. 2 (June 2004): 203–10. http://dx.doi.org/10.1614/wt01-68.
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Field experiments were conducted across the north-central United States to determine the benefits of various weed control strategies in corn. Weed control, corn yield, and economic return increased when a preemergence (PRE) broad-spectrum herbicide was followed by (fb) postemergence (POST) herbicides. Weed control decisions based on field scouting after a PRE broad-spectrum herbicide application increased weed control and economic return. Application of a PRE grass herbicide fb a POST herbicide based on field scouting resulted in less control of velvetleaf and morningglory species, corn yield, and economic return compared with a PRE broad-spectrum herbicide application fb scouting. Cultivation after a PRE broad-spectrum herbicide application increased weed control and corn yield compared with the herbicide applied alone, but economic return was not increased. An early-postemergence herbicide application fb cultivation resulted in the highest level of broadleaf weed control, the highest corn yield, and the greatest economic return compared with all other strategies. Weed control based on scouting proved to be useful in reducing the effect of weed escapes on corn yield and increased economic return compared with PRE herbicide application alone. However, economic return was not greater than the PRE fb planned POST or total POST strategies.
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Štefanić, Edita, Đorđe Maletić, Dinko Zima, and Ivan Štefanić. "Economic evaluation of different strategy for weed management in garlic production." Zbornik Veleučilišta u Rijeci 8, no. 1 (2020): 445–54. http://dx.doi.org/10.31784/zvr.8.1.5.
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A field experiment was conducted to evaluate various weed management options on garlic (Alium sativum L.) production in Northeastern Croatia. This study focus on how different strategies of weed control affects weed community composition and economic benefit of weed management. An experiment was arranged as a complete block design with three different weed management strategies: chemical control (PRE EM and POST EM), mechanical control (three times during the season), and combination of chemical and mechanical treatments, together with weeded checks. Data on weed density, fresh above weed biomass and garlic yield per m2 were collected at the end of the growing season, and were subjected to statistical and economic analysis. The mayor weeds found in the experimental plots were: Sorghum halepense, Ambrosia artemisiifolia, Cirsium arvense and Chenopodium album. The various weed growth (density and biomass) and yield varied with application of weed management practices. Significantly lower values of weed density and fresh above weed biomass were recorded on plots with mechanical and combination of chemical and mechanical treatments compared to weeded check. Chemical application gave in this study insufficient weed control and resulted in lower yields compared to the mechanical treatments and combination of mechanical and mechanical weed control. The best cost: benefit ratio was observed on treatment with combination of chemical and mechanical weed control and can be successfully applied to boost up the bulb yield in garlic and to harvest the maximum profit for farmers.
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Hamill, Allan S., and Jianhua Zhang. "Herbicide reduction in metribuzin-based weed control programs in corn." Canadian Journal of Plant Science 75, no. 4 (October 1, 1995): 927–33. http://dx.doi.org/10.4141/cjps95-156.
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The relative effectiveness of 13 metribuzin-based weed control programs in field corn was investigated in a 3-yr study. Reduction in herbicide rates was made by modifying some commonly used metribuzin-based herbicide programs for weed control in corn. Satisfactory weed control, corn yield and economic return were obtained under each herbicide treatment, suggesting that reduction in herbicide use to reduce environmental hazard and enhance the economical benefit is achievable. Among the various herbicide programs, banded herbicide application at reduced rates plus one cultivation was observed to be the most economic weed management practice. Herbicides applied early (2–3 leaves) showed better results than those applied later (6–7 leaves) in the development stage of corn, although both times of application are within the critical period of weed control for corn. Key words: Corn (Zea mays), economic return, herbicides, weed control
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Reddy, Krishna N. "Weed Control and Economic Comparisons in Soybean Planting Systems." Journal of Sustainable Agriculture 21, no. 2 (November 12, 2002): 21–35. http://dx.doi.org/10.1300/j064v21n02_04.
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Auld, Bruce A., and Clem A. Tisdell. "Economic thresholds and response to uncertainty in weed control." Agricultural Systems 25, no. 3 (January 1987): 219–27. http://dx.doi.org/10.1016/0308-521x(87)90021-7.
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Vere, David T., Bruce A. Auld, and Malcolm H. Campbell. "Economic Assessments of Serrated Tussock (Nassella trichotoma) as a Pasture Weed." Weed Technology 7, no. 3 (September 1993): 776–82. http://dx.doi.org/10.1017/s0890037x00037702.
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Weeds reduce the livestock production from pastures and impose control costs on producers and governments. Economic assessments of pasture weed problems are required on and beyond the farm for planning private and public weed control. This requirement has several dimensions that can be used to demonstrate the economic effect of weeds and encourage weed control by the private and public sectors. This paper discusses the economic problems of pasture weeds and the procedures for multi-level economic assessments with a major pasture weed in Australia as an example, and demonstrates the important private and social economic benefits from controlling this weed.
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Takács-György, Katalin, and István Takács. "Risk Assessment and Examination of Economic Aspects of Precision Weed Management." Sustainability 3, no. 8 (July 27, 2011): 1114–35. http://dx.doi.org/10.3390/su3081114.
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Hamill, Allan S., Susan E. Weaver, Peter H. Sikkema, Clarence J. Swanton, Francois J. Tardif, and Gabrielle M. Ferguson. "Benefits and Risks of Economic vs. Efficacious Approaches to Weed Management in Corn and Soybean." Weed Technology 18, no. 3 (September 2004): 723–32. http://dx.doi.org/10.1614/wt-03-166r.
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A 3-yr study was conducted on nine farms across southern Ontario to evaluate the risks and benefits of different approaches to weed management in corn and soybean. Weed control decisions were based on field scouting and recommendations from the Ontario version of HADSS™, the herbicide application decision support system. Treatments were selected to maximize profit (economic threshold approach) or to maximize yield (highest treatment efficacy). Reduced rates of the high efficacy treatment for each field also were included. Weed density before and after treatment, crop yields, weed seed return, and the effect of weed control decisions on weed density 1 yr after treatment were assessed. Crop yield varied among years and farms but was not affected by weed control treatment. Weed control at 28 d after treatment (DAT) was often lower and weed density, biomass, and seed production 70 DAT were often higher with the profit maximization approach compared with the yield maximization approach. However, weed density 1 yr later, after each cooperator had applied a general weed control program, did not vary significantly among the previous year's weed control treatments. Reduced rates of the high efficacy treatments did not lead to increased weed problems the next year, despite lower weed control and increased weed seed production in some years. During the 3 yr of the study, weed control costs with the profit maximization approach were approximately Can$45/ha less than with the yield maximization approach.
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Keller, Martina, Geoffroy Gantoli, Jens Möhring, Christoph Gutjahr, Roland Gerhards, and Victor Rueda-Ayala. "Integrating Economics in the Critical Period for Weed Control Concept in Corn." Weed Science 62, no. 4 (December 2014): 608–18. http://dx.doi.org/10.1614/ws-d-13-00184.1.
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The effect of weed interference on corn yield and the critical period for weed control (CPWC) were determined in Germany and Benin. Treatments with weed control starting at different crop growth stages and continuously kept weed-free until harvest represented the “weed-infested interval.” Treatments that were kept weed-free from sowing until different crop growth stages represented the “weed-free interval.” Michaelis–Menten, Gompertz, logistic and log–logistic models were employed to model the weed interference on yield. Cross-validation revealed that the log–logistic model fitted the weed-infested interval data equally well as the logistic and slightly better than the Gompertz model fitted the weed-free interval. For Benin, economic calculations considered yield revenue and cost increase due to mechanical weeding operations. Weeding once at the ten-leaf stage of corn resulted already profitable in three out of four cases. One additional weeding operation may optimize and assure profit. Economic calculations for Germany determined a CPWC starting earlier than the four-leaf stage, challenging the decade-long propagated CPWC for corn. Differences between Germany and Benin are probably due to the higher yields and high costs in Germany. This study provides a straightforward method to implement economic data in the determination of the CPWC for chemical and nonchemical weed control strategies.
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Foshee, Wheeler G., Robert W. Goodman, Michael G. Patterson, William D. Goff, and W. Alfred Dozier. "Weed Control Increases Yield and Economic Returns from Young `Desirable' Pecan Trees." Journal of the American Society for Horticultural Science 122, no. 4 (July 1997): 588–93. http://dx.doi.org/10.21273/jashs.122.4.588.
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Yields and economic returns above treatment variable costs were determined for young `Desirable' pecan [Carya illinoinensis (Wangenh.) C. Koch] trees grown for nine seasons under ten combinations of orchard floor management practice and irrigation. Orchard floor management practices were 1) no weed control, 2) mowed, 3) total weed control with herbicides, 4) grass control only with herbicides, or 5) disking, and trees were either irrigated or nonirrigated. Total weed control with herbicides increased cumulative yield through the ninth growing season by 358% compared to no weed control. In the humid environment where this experiment was conducted, irrigation did not increase crop value obtained from the young trees, except for 1 year. At the end of the ninth season, total weed control with herbicides was the only treatment to have a positive net present value. These data indicate that establishment costs for young `Desirable' pecan trees can be recovered as early as the eighth growing season if competition from weeds is totally eliminated.
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Osipitan, O. Adewale, I. Yahaya, and Joseph A. Adigun. "Economics of Weed Management Methods as Influenced by Row-Spacing in Cowpea." Journal of Agricultural Science 10, no. 2 (January 12, 2018): 98. http://dx.doi.org/10.5539/jas.v10n2p98.
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Weed management is an important factor that influences the economic importance of cowpea as a cheap source of food and income for many farmers. A study was conducted to evaluate economic benefits of weed management methods used singly or in an integrated approach, and to understand the influence of row-spacing on economic benefits of weed management methods. Total variable cost of cowpea cultivation was substantially influenced by cost of weed control. A single input of hand weeding resulted in higher cost of weed control than a single input of PRE-herbicide for weed control. Increase in weed control inputs or frequency did not guarantee an increase in economic benefits. For example, removing weeds three times with hand at 3, 6 and 9 weeks after planting (WAP) during the cowpea growing season did not necessarily result in the highest yield, but rather increased the variable cost of weed control. Integrating PRE-herbicide and hand weeding for weed management resulted in the highest yield and gross profit. The lowest cost of weed control provided by using PRE-herbicide gave the highest benefit-cost ratio. The differences in economic values of weed management methods were mostly not affected by cowpea row-spacing, but generally, economic benefits of management methods decreased with increase in row-spacing. Practically, this study suggests that minimizing the use of hand weeding by complementing with PRE-herbicide for weed management could help to optimize yield, and increase profitability, particularly under a narrow row-spacing in cowpea cultivation.
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Panetta, F. Dane. "Weed Eradication—An Economic Perspective." Invasive Plant Science and Management 2, no. 4 (October 2009): 360–68. http://dx.doi.org/10.1614/ipsm-09-003.1.
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AbstractThere has been recent interest in determining the upper limits to the feasibility of weed eradication. Although a number of disparate factors determine the success of an eradication program, ultimately eradication feasibility must be viewed in the context of the amount of investment that can be made. The latter should reflect the hazard posed by an invasion, with greater investment justified by greater threats. In simplest terms, the effort (and hence investment) to achieve weed eradication comprises the detection effort required to delimit an invasion plus the search and control effort required to prevent reproduction until extirpation occurs over the entire infested area. The difficulty of estimating the required investment at the commencement of a weed eradication program (as well as during periodic reviews) is a serious problem. Bioeconomics show promise in determining the optimal approach to managing weed invasions, notwithstanding ongoing difficulties in estimating the costs and benefits of eradication and alternative invasion management strategies. A flexible approach to the management of weed invasions is needed, allowing for the adoption of another strategy when it becomes clear that the probability of eradication is low, owing to resourcing or intractable technical issues. Whether the considerable progress that has been achieved towards eradication of the once massive witchweed invasion can be duplicated for other weeds of agricultural systems will depend to a large extent upon investment (> $250 million over 50 yr in this instance). Weeds of natural ecosystems seem destined to remain more difficult eradication targets for a variety of reasons, including higher impedance to eradication, more difficulty in valuing the benefits arising from eradication, and possibly less willingness to pay from society at large.
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Buhler, Douglas D., Robert P. King, Scott M. Swinton, Jeffery L. Gunsolus, and Frank Forcella. "Field evaluation of a bioeconomic model for weed management in soybean (Glycine max)." Weed Science 45, no. 1 (February 1997): 158–65. http://dx.doi.org/10.1017/s0043174500092626.
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A bioeconomic model was tested as a decision aid for weed control in soybean at Rosemount, MN, from 1991 to 1994. The model makes recommendations for preplant incorporated and preemergence control tactics based on the weed seed content of the soil and postemergence decisions based on weed seedling densities. Weed control, soybean yield, herbicide use, and economic return with model-generated treatments were compared to standard herbicide and mechanical control systems. Effects of these treatments on weed populations and corn yield the following year were also determined. In most cases, the model-generated treatments controlled weeds as well as a standard herbicide treatment. Averaged over the 3 yr, the quantity of herbicide active ingredient applied was decreased by 47% with the seedbank model and 93% with the seedling model compared with a standard soil-applied herbicide treatment. However, the frequency of herbicide application was not reduced. Soybean yields reflected differences in weed control and crop injury. Net economic return to weed control was increased 50% of the time using model-recommended treatments compared with a standard herbicide treatment. Weed control treatments the previous year affected weed density in the following corn crop but had little effect on weed control or corn yield. The bioeconomic model was responsive to differing weed populations, maintained weed control and soybean yield and often increased economic returns under the weed species and densities in this research.
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Galassi, Giuseppe. "Epistemological aspects of the economic control." De Computis - Revista Española de Historia de la Contabilidad 16, no. 1 (June 26, 2019): 31. http://dx.doi.org/10.26784/issn.1886-1881.v16i1.343.
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Epistemology is essential for probing the fundamental issues of the management sciences, included the ‘economic control process’. The paper aims to highlight the connections between economia aziendale, the typical Italian research program, as well as the traditional research programs of Continental European Countries, with a theoretical reconstruction founded also on modern epistemological issues. One fundamental question, for instance, is about the ‘true’ information or knowledge conveyed by a financial statement, taking into account that economia aziendale, the general system, was conceived as consisting of interrelated sub-systems of management, organization and data gathering for planning and control. The ‘economic control’, both antecedent, concomitant and subsequent, refers to the azienda, the economic entity, that is to every kind of economic unit, not only to the business enterprise.The ‘economic control’ is concerned with social responsibility, ethical conduct, as well as with ‘evidence’, ‘proof’, opinions and judgments. The credibility of a hypothesis depends on the associated evidence, so it is not independent from the strength of the entire argument, ‘evidence plus hypothesis’. The ‘degree of confidence’ implies probability, specifically the bayesian approach for modifying early prior valuations in the light of further information, obtaining revised posterior probabilities. The essential requirement of a proof is that it is ‘psychologically satisfying’; the problem of the controller’s independence stresses the controlling ethical standards. The code of ethics and rules of conduct should serve to identify responsibilities and aims involved – greater accountability through better information about ends and means – and to underline the need for a theoretical foundation about ethics of accounting and economic controlling. Of particular interest is the dichotomy ‘subjective-objective’ related also to economic reality, every kind of reality, included physical as well as cultural ones. This brings directly in the field of accounting and ‘entity economics’ metaphors. The economic controlling process is tightly connected to interpersonal analogy and to the ‘social agreement approach’ to ‘objectivity’ and scientific methodology. There is often no possible control through ‘correspondence’ with definite aspects of reality, economic-financial events themselves. System theorists employ many concepts that correspond to ‘independent reality’ only through ‘indicator hypotheses’ such as ‘business income’ magnitude, the best proxy of the economic efficiency of the ‘business entity’.
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Gallus, Silvano, and Carlo La Vecchia. "Tobacco control: Economic aspects of smoking." Preventive Medicine 55, no. 6 (December 2012): 546–47. http://dx.doi.org/10.1016/j.ypmed.2012.09.011.
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Buhler, Douglas D., Robert P. King, Scott M. Swinton, Jeffery L. Gunsolus, and Frank Forcella. "Field Evaluation of a Bioeconomic Model for Weed Management in Corn (Zea mays)." Weed Science 44, no. 4 (December 1996): 915–23. http://dx.doi.org/10.1017/s0043174500094923.
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A bioeconomic weed management model was tested as a decision aid for weed control in corn at Rosemount, MN, from 1991 to 1994. The model makes recommendations for preemergence control tactics based on the weed seed content of the soil and postemergence decisions based on weed seedling densities. Weed control, corn yield, herbicide active ingredient applied, and economic return with model-generated treatments were compared to standard herbicide and mechanical control treatments. Effects of these treatments on weed populations and soybean yield the following year were also determined. In most cases, the model-generated treatments controlled weeds as well as the standard herbicide treatment. The quantity of herbicide active ingredient applied decreased 27% with the seed bank model and 68% with the seedling model relative to the standard herbicide treatment. However, the frequency of herbicide application was not reduced. In 1 yr, seed bank model treatments did not control weeds as well as the standard herbicide or seedling model treatments. Corn yields reflected differences in weed control. Net economic return to weed control was not increased by using model-generated control recommendations. Weed control treatments the previous year affected weed density in the following soybean crop. In 2 of 3 yr, these differences did not after weed control or soybean yield. Although tactics differed, the bioeconomic model generally resulted in weed control and corn yield similar to the standard herbicide. The model was responsive to differing weed populations, but did not greatly after economic returns under the weed species and densities in this research.
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Lindquist, John L., J. Anita Dieleman, David A. Mortensen, Gregg A. Johnson, and Dawn Y. Wyse-Pester. "Economic Importance of Managing Spatially Heterogeneous Weed Populations." Weed Technology 12, no. 1 (March 1998): 7–13. http://dx.doi.org/10.1017/s0890037x00042482.
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Three methods of predicting the impact of weed interference on crop yield and expected economic return were compared to evaluate the economic importance of weed spatial heterogeneity. Density of three weed species was obtained using a grid sampling scheme in 11 corn and 11 soybean fields. Crop yield loss was predicted assuming densities were homogeneous, aggregated following a negative binomial with known population mean and k, or aggregated with weed densities spatially mapped. Predicted crop loss was lowest and expected returns highest when spatial location of weed density was utilized to decide whether control was justified. Location-specific weed management resulted in economic gain as well as a reduction in the quantity of herbicide applied.
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Vidal, N. R., and R. A. Vidal. "Augmented reality systems for weed economic thresholds applications." Planta Daninha 28, no. 2 (June 2010): 449–54. http://dx.doi.org/10.1590/s0100-83582010000200025.
Full textAbstract:
The augmented reality (AR) technology has applications in many fields as diverse as aeronautics, tourism, medicine, and education. In this review are summarized the current status of AR and it is proposed a new application of it in weed science. The basic algorithmic elements for AR implementation are already available to develop applications in the area of weed economic thresholds. These include algorithms for image recognition to identify and quantify weeds by species and software for herbicide selection based on weed density. Likewise, all hardware necessary for AR implementation in weed science are available at an affordable price for the user. Thus, the authors propose weed science can take a leading role integrating AR systems into weed economic thresholds software, thus, providing better opportunities for science and computer-based weed control decisions.
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Czapar, George F., Marc P. Curry, and Loyd M. Wax. "Grower Acceptance of Economic Thresholds for Weed Management in Illinois." Weed Technology 11, no. 4 (December 1997): 828–31. http://dx.doi.org/10.1017/s0890037x00043517.
Full textAbstract:
Although economic thresholds are often used to make insect control decisions, the use of thresholds for weed management has been limited. Surveys of growers, agricultural chemical dealers, and farm managers/rural appraisers helped identify limitations to grower acceptance of economic thresholds for weed management. Most growers were concerned about harvest problems due to weeds, with 64% identifying this factor as a major limitation. Landlord perception and weed seed production were identified by 38% of the growers as major limitations, while 36% of the growers listed general appearance of the field as reasons. In contrast, 75% of the agricultural chemical dealers and 63% of the farm managers surveyed listed field appearance as a major reason limiting grower acceptance of economic thresholds for weed management. Since grower concerns involve risk management and future profitability, economic weed thresholds that address long-term costs and benefits of weed control decisions may be more fully accepted.
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Dieleman, Anita, Allan S. Hamill, Glenn C. Fox, and Clarence J. Swanton. "Decision Rules for Postemergence Control of Pigweed (Amaranthusspp.) in Soybean (Glycine max)." Weed Science 44, no. 1 (March 1996): 126–32. http://dx.doi.org/10.1017/s0043174500093656.
Full textAbstract:
Weed control decision rules were derived for the application of postemergence herbicides to control pigweed species in soybean. Field experiments were conducted at two locations in 1992 and 1993 to evaluate soybean-pigweed interference. A damage function was determined that related yield loss to time of pigweed emergence, density, and soybean weed-free yield. A control function described pigweed species response to variable doses of imazethapyr and thifensulfuron. The integration of these two functions formed the basis of an economic model used to derive two weed control decision rules, the biologist's “threshold weed density” and the economist's “optimal dose.” Time of weed emergence had a more significant role than weed density in the economic model. Later-emerging pigweed caused less yield loss and therefore, decision rules lead to overuse of herbicides if emergence time is not considered. The selected herbicide dose influenced the outcome of the control function. Depending on the desired level of weed control, a herbicide could be chosen to either eradicate the escaped weed species (label or biologically-effective doses) or reduce the growth of the weed species and thereby offset interference (optimal dose). The development of a biologically-effective dose by weed species matrix was recommended. Decision rules should not be utilized as an exclusive weed management strategy but rather as a component of an integrated weed management program.