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• W2005166685 abstract "This study is a sequel to one providing a methodological framework for evaluating the economic and soil-erosion effects associated with different crop rotational systems involving corn on southern Ontario cash-cropping farms. A multi-period linear programming (MPLP) model is used to estimate the impact on rational crop rotational choices, fam-level profitability and soil-erosion rates of having different values for the more important economic variables. The variables examined are relative cash-crop prices, fossil fuel energy-related production costs, discount rates, and values attached to soil lost through erosion. The MPLP model is solved in turn for each of a range of values for one of the economic variables at a time, the selection of values being based upon recent historical experience. Where no change in rotational system is prompted within the range, the MPLP model is used to find the value of each economic variable that would be required to trigger the choice of some alternative rotational system. Each of these model runs is performed for the case where yields of all crops over a 20-year time horizon are firstly assumed constant, and secondly assumed to suffer a cumulative decline.Cet article fait suite a une etude methodologique dont le but a ete d'valuer les effets economiques et erosifs de systemes de production produisant essentiellement du mais en rotation avec d'autres cultures. Cette methode d'analyse est appliquee a des exploitations agricoles localisees dans le Sud de I'Ontario et specialisees dans les cultures commerciales. Pour ce faire, un modele lineaire multi-periode (MPLP) est utilise pour estimer I'impact d'un changement dans les principales variables economiques sur le choix des rotations culturales, le niveau de rentabilite des systemes de production et les taux d'erosion des sols. Les variables economiques prises en compte sont les prix relatifs des cultures commerciales, les couts de production associes a la consommation d'energie fossile, les taux d'actualisation et les pertes absolues en sol dues a l'erosion. Le modele lineaire (MPLP) est de nouveauresolu pour chaque variable economique en les parametrisant sur un intervalle de valeurs selectionnees a partir de donntes historiques recentes. Lorsqu'il n'y a aucun changement dans la rotation culturale, le modele determine le niveau de chaque variable qui entrainerait la prise en consideration d'une rotation culturale alternative. Toutes les simulations ont ete effectuees sur une periode de vingt ans en adoptant deux variantes sur I'tvolution des ren-dements des cultures commerciales: premierement, les rendements restent constants durant toute la periode, et deuxiemement, les rendements decroissent de maniere cumulative." @default.
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• W2005166685 date "1987-07-01" @default.
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• W2005166685 title "The Impacts of Changes in Key Economic Variables on Crop Rotational Choices on Ontario Cash-Cropping Farms" @default.
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• W2005166685 doi "https://doi.org/10.1111/j.1744-7976.1987.tb02237.x" @default.
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