| 依边际分析法确定田间最优经济水量投入的唯一性准则 |
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| 引用本文： | 刘文兆.依边际分析法确定田间最优经济水量投入的唯一性准则[J].中国农业大学学报,1997(Z1). |
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| 作者姓名： | 刘文兆 |
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| 作者单位： | 中国科学院水利部水土保持研究所; |
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| 基金项目： | 国家自然科学基金(59509001) |
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| 摘 要： | 应用边际均等原理确定纯收益最大的田间水量投入的条件是水的价格 C_W 与产量的价格 C_Y 的比率等于边际产量 dy/dx,其中 x 只能唯一地限定为灌溉量。将 x 取为农田耗水量,用以求算所谓最优经济耗水量,是没有理论依据的。作物产量与灌溉定额间的相关程度取决于耗水量与灌溉量间关系的密切与否。
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| 关 键 词： | 节水灌溉 作物水分和生产函数 边际分析 灌溉定额 |
An Essential Requirement of Marginal Analysis Method for Calculating Farmland Water Input with the Maximum Profits in Water-Saving Irrigation |
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| Liu Wenzhao.An Essential Requirement of Marginal Analysis Method for Calculating Farmland Water Input with the Maximum Profits in Water-Saving Irrigation[J].Journal of China Agricultural University,1997(Z1). |
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| Authors: | Liu Wenzhao |
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| Institution: | Liu Wenzhao (Institute of Soil , Water Conservation,Chinese Academy of Sciencest , Ministry of Water Resources 712100) |
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| Abstract: | The formula to calculate farmland water input with the maximum profits by means of marginal analysis is that the ratio of C_W(water price)to C_y(grain price)equals d_y/ d_x(marginal crop yield function),in which x only represents irrigation water.It has no theoretical bases to calculate field water consumption with the maximum profits through letting the x represent water consumption of cropland.The correlation degree of crop yield to irrigation quota is dependent on the relation between water consumption a... |
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| Keywords: | water-saving irrigation function of crop water production marginal analysis irrigation quota |
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