The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jesusa C Beltran - One of the best experts on this subject based on the ideXlab platform.
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a bioeconomic model for analysis of Integrated Weed Management strategies for annual barnyardgrass echinochloa crus galli complex in philippine rice farming systems
Agricultural Systems, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. Pannell, Benedict WhiteAbstract:Abstract This paper describes a dynamic simulation model that allows for comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include Weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Results broadly indicate that a mixture of chemical and non-chemical treatments provides good Weed control in rice crops, and maximises long-term profit for systems where the main Weed is annual barnyardgrass. However, the performance of this strategy is heavily influenced by crop establishment method and labour cost. At current labour cost and low Weed density, the regular use of manual Weeding is the most valuable primary form of Weed control in rice farming systems, relative to herbicide application. Herbicide application becomes more profitable than manual Weeding when labour costs increase or the population of barnyardgrass plants is not maintained at its optimal level. These results illustrate the value of the model for guiding the efficient control of annual barnyardgrass in rice crops in the Philippines.
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economic implications of herbicide resistance and high labour costs for Management of annual barnyardgrass echinochloa crus galli in philippine rice farming systems
Crop Protection, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. PannellAbstract:Abstract Implications of increasing labour costs and the development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass ( Echinochloa crus-galli ) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It is worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
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economic impacts of high labour cost and herbicide resistance for the Management of annual barnyardgrass echinochloa crus galli in rice production in the philippines
2011Co-Authors: Jesusa C Beltran, David J. Pannell, Graeme J DooleAbstract:Implications of increasing labour cost and development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It may be worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
Graeme J Doole - One of the best experts on this subject based on the ideXlab platform.
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a bioeconomic model for analysis of Integrated Weed Management strategies for annual barnyardgrass echinochloa crus galli complex in philippine rice farming systems
Agricultural Systems, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. Pannell, Benedict WhiteAbstract:Abstract This paper describes a dynamic simulation model that allows for comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include Weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Results broadly indicate that a mixture of chemical and non-chemical treatments provides good Weed control in rice crops, and maximises long-term profit for systems where the main Weed is annual barnyardgrass. However, the performance of this strategy is heavily influenced by crop establishment method and labour cost. At current labour cost and low Weed density, the regular use of manual Weeding is the most valuable primary form of Weed control in rice farming systems, relative to herbicide application. Herbicide application becomes more profitable than manual Weeding when labour costs increase or the population of barnyardgrass plants is not maintained at its optimal level. These results illustrate the value of the model for guiding the efficient control of annual barnyardgrass in rice crops in the Philippines.
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economic implications of herbicide resistance and high labour costs for Management of annual barnyardgrass echinochloa crus galli in philippine rice farming systems
Crop Protection, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. PannellAbstract:Abstract Implications of increasing labour costs and the development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass ( Echinochloa crus-galli ) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It is worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
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economic impacts of high labour cost and herbicide resistance for the Management of annual barnyardgrass echinochloa crus galli in rice production in the philippines
2011Co-Authors: Jesusa C Beltran, David J. Pannell, Graeme J DooleAbstract:Implications of increasing labour cost and development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It may be worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
Benedict White - One of the best experts on this subject based on the ideXlab platform.
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a bioeconomic model for analysis of Integrated Weed Management strategies for annual barnyardgrass echinochloa crus galli complex in philippine rice farming systems
Agricultural Systems, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. Pannell, Benedict WhiteAbstract:Abstract This paper describes a dynamic simulation model that allows for comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include Weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Results broadly indicate that a mixture of chemical and non-chemical treatments provides good Weed control in rice crops, and maximises long-term profit for systems where the main Weed is annual barnyardgrass. However, the performance of this strategy is heavily influenced by crop establishment method and labour cost. At current labour cost and low Weed density, the regular use of manual Weeding is the most valuable primary form of Weed control in rice farming systems, relative to herbicide application. Herbicide application becomes more profitable than manual Weeding when labour costs increase or the population of barnyardgrass plants is not maintained at its optimal level. These results illustrate the value of the model for guiding the efficient control of annual barnyardgrass in rice crops in the Philippines.
David J. Pannell - One of the best experts on this subject based on the ideXlab platform.
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a bioeconomic model for analysis of Integrated Weed Management strategies for annual barnyardgrass echinochloa crus galli complex in philippine rice farming systems
Agricultural Systems, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. Pannell, Benedict WhiteAbstract:Abstract This paper describes a dynamic simulation model that allows for comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include Weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Results broadly indicate that a mixture of chemical and non-chemical treatments provides good Weed control in rice crops, and maximises long-term profit for systems where the main Weed is annual barnyardgrass. However, the performance of this strategy is heavily influenced by crop establishment method and labour cost. At current labour cost and low Weed density, the regular use of manual Weeding is the most valuable primary form of Weed control in rice farming systems, relative to herbicide application. Herbicide application becomes more profitable than manual Weeding when labour costs increase or the population of barnyardgrass plants is not maintained at its optimal level. These results illustrate the value of the model for guiding the efficient control of annual barnyardgrass in rice crops in the Philippines.
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economic implications of herbicide resistance and high labour costs for Management of annual barnyardgrass echinochloa crus galli in philippine rice farming systems
Crop Protection, 2012Co-Authors: Jesusa C Beltran, Graeme J Doole, David J. PannellAbstract:Abstract Implications of increasing labour costs and the development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass ( Echinochloa crus-galli ) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It is worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
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economic impacts of high labour cost and herbicide resistance for the Management of annual barnyardgrass echinochloa crus galli in rice production in the philippines
2011Co-Authors: Jesusa C Beltran, David J. Pannell, Graeme J DooleAbstract:Implications of increasing labour cost and development of herbicide resistance for profitable Weed Management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of Integrated Weed Management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual Weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance results in substantial losses in farm profit. It may be worthwhile for farmers to take Management actions to prevent or delay the onset of herbicide resistance, provided that these changes are effective and not too costly. The study highlights the complexity of decision making about Integrated Weed Management on rice farms in the Philippines.
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herbicide resistance and the adoption of Integrated Weed Management by western australian grain growers
Agricultural Economics, 2007Co-Authors: Rick Llewellyn, David J. Pannell, Robert K Lindner, Stephen B PowlesAbstract:Extension programs to encourage farmers to reduce reliance on herbicides by adopting Integrated Weed Management (IWM) practices have met with limited success. Studies aiming to understand the factors that influence farmers’ choices of Integrated control practices have faced difficulties in variable specification, and have not achieved high explanatory power. Using data from grain growers in Western Australia, where herbicide resistance in major crop Weeds is common, this study tests the applicability of a framework for the IWM adoption decision in which herbicide efficacy is assumed to be a potentially exhaustible resource. Farmers’ perceptions of multiple techniques and other variables are aggregated using principal components, and used in logistic regressions to explain the intensity of use of IWM practices. Eighty-six percent of growers were correctly classified according to use of multiple IWM practices. Herbicide resistance and expectations of the future availability of effective new herbicides were significant in explaining IWM adoption. IWM adoption and herbicide-resistance Management are shown to be information-intensive and involving an intertemporal resource Management decision.
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grain grower perceptions and use of Integrated Weed Management
Australian Journal of Experimental Agriculture, 2004Co-Authors: Rick Llewellyn, David J. Pannell, Robert K Lindner, Stephen B PowlesAbstract:Greater adoption of Integrated Weed Management, to reduce herbicide reliance, is an objective of many research and extension programmes. In Australian grain-growing regions, Integrated Weed Management is particularly important for the Management of herbicide resistance in Weeds. In this study, survey data from personal interviews with 132 Western Australian grain growers are used to characterise the use and perceptions of Integrated Weed Management practices. The main objective was to identify opportunities for improved Weed Management decision making, through targeted research and extension. The extent to which Integrated Weed Management practices are used on individual farms was measured. Perceptions of the efficacy and reliability of various Weed Management practices were elicited for control of annual ryegrass (Lolium rigidum Gaud.), along with perceptions of the economic value of Integrated Weed Management practices relative to selective herbicides. All growers were shown to be using several Integrated Weed Management practices, although the use of some practices was strongly associated with the presence of a herbicide-resistant Weed population. In general, both users and non-users were found to have high levels of awareness of Integrated Weed Management practices and their Weed control efficacy. Herbicide-based practices were perceived to be the most cost-effective. Opportunities for greater adoption of Integrated Weed Management practices, to conserve the existing herbicide resource, exist where practices can be shown to offer greater shorter-term economic value, not necessarily just in terms of Weed control, but to the broader farming system.
Nicolas Munierjolain - One of the best experts on this subject based on the ideXlab platform.
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assessing nitrate leaching in cropping systems based on Integrated Weed Management using the stics soil crop model
European Journal of Agronomy, 2015Co-Authors: C Becel, Nicolas Munierjolain, B NicolardotAbstract:Abstract Agriculture in Europe and other parts of the world is currently under strong pressure to reduce its reliance on pesticides. Regarding arable crops, strategies based on Integrated Weed Management (IWM) combine several agronomic practices aimed at reducing herbicide use, but these strategies can generate negative collateral effects, such as increased nitrate leaching. An evaluation of nitrate leaching in a long-term experiment set up in 2000 was performed for five tested cropping systems: four IWM-based systems and one reference system. After the validation of the predictive performance of the STICS soil–crop model, nitrate leaching was simulated for the five cropping systems tested over the 12 years of the experiment and over 12 years of implementing alternative scenarios (i.e. the introduction of early sowing for winter cereals, ceasing deep tillage and the introduction of a mustard catch crop). The results showed that the total amount of nitrate leaching varied between cropping systems and was lowest in the cropping system using no herbicide and that with no tillage, two systems combining several agronomic practices. Alternative scenarios based on both early sowing of winter crops and the introduction of catch crops can reduce the total amount of nitrate leached by 25 to 43% over the 12 years of simulations, although early sowing can, in some cases, increase nitrate leaching. This study contributes to the multi-criteria evaluation of innovative cropping systems.
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is Integrated Weed Management efficient for reducing environmental impacts of cropping systems a case study based on life cycle assessment
European Journal of Agronomy, 2012Co-Authors: Violaine Deytieux, Thomas Nemecek, Ruth Freiermuth Knuchel, Gerard Gaillard, Nicolas MunierjolainAbstract:Abstract Integrated Weed Management in arable crops relies on the combination of various measures for preventing, avoiding and suppressing Weeds, with the aim of reducing the reliance on herbicides and their environmental impacts. As IWM requires potentially deep changes in the cropping systems, modifying e.g. the crop sequence, the strategies for soil tillage and eventually introducing mechanical Weeding, it is important to perform comprehensive evaluations of IWM-based cropping system prototypes. In this study, a Life Cycle Assessment method was used to compute several environmental impacts for four variants of IWM-based cropping system tested over a pluri-annual experiment, and compared with a standard reference. When expressed per unit of cultivated area, most environmental indicators were improved in IWM-based systems, including the energy input, greenhouse gas emission, eutrophication and acidification, and ecotoxicity and human toxicity. In-field fuel consumption was a rather minor contribution to the overall energy demand and to global warming. The ranking of the tested cropping systems was different when the indicators were expressed per unit of harvested agricultural goods or per unit of farmer's income. With these two functional units, the differences among systems tended to be weaker, and some indicators of environmental impacts were higher in IWM-based systems. Indicators focusing on biodiversity and soil quality displayed few differences among systems.
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using a farming system model to evaluate cropping system prototypes are labour constraints and economic performances hampering the adoption of Integrated Weed Management
European Journal of Agronomy, 2010Co-Authors: Gabriel Pardo, M Riravololona, Nicolas MunierjolainAbstract:Abstract This study extends into the economic domain the analysis of a trial comparing cropping system prototypes based on the principles of Integrated Weed Management (IWM), which demonstrated their potential for managing Weed infestations. A farm simulation model was used to analyse the consequences of implementing such IWM-based cropping systems at the farm scale. The labour requirement for field operations and their distribution over the year were compared to the amount of time when field conditions were suitable for the corresponding equipments. In the simulated IWM-based virtual farms, repeated shallow soil cultivations for promoting pre-sowing Weed emergence and mechanical Weeding could both be accommodated during suitable periods, but the rule of late cereal sowings for escaping periods of peak Weed emergence generated possible labour bottlenecks. Machinery costs were calculated from the farm simulations so that the economic profitability of the virtual farms could be compared. In the economic context of 2006, the saving of input costs did not offset low yields of spring crops introduced in the crop sequence for diversifying sowing dates as required by IWM principles. The method of farm simulations could be used with other data sets from cropping system experiments to provide the required knowledge for supporting future policy development in Europe.
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Integrated Weed Management systems allow reduced reliance on herbicides and long term Weed control
Agriculture Ecosystems & Environment, 2009Co-Authors: Regis Chikowo, V Faloya, Sandrine Petit, Nicolas MunierjolainAbstract:Current concerns about the environmental impacts of pesticide use in agriculture require the investigation of novel cropping systems that would reduce their reliance on pesticides. In this paper, we report on an experiment carried out over 6 years to assess the performance of four cropping systems based on Integrated Weed Management (IWM) as compared to a reference standard system. Systems differed in crop rotations, soil tillage, mechanical and chemical Weeding and crop Management. Fewer herbicides were applied in IWM-based systems as compared to the reference, resulting in a lower environmental impact. Over the 6 years, we detected no significant increase in the density of winter or summer annual broad-leaved, and of grassy Weeds in IWM systems, with one exception that is discussed. These results indicate that the combination of various IWM techniques allow both the long-term control of arable Weeds and a significantly reduced reliance on herbicides.