摘要
本文通过分析多年的冬小麦试验资料,结果表明:冬小麦的产量与耗水量呈二次函数关系.在此基础上,利用边际分析得出:水源充足地区,净效益最大时的条件为灌溉用水与作物的价格之比等于水分边际产量(dY dx).由此确定了经济灌溉定额.就平常年份来说,实施经济灌溉定额后,每hm2比最大产量灌溉定额节水44m3,而产量仅下降不到1%.
Through analyzing the wheat experimental data, the relationship between the wheat yield and water consumption (ET) in the north of Henan province is studied and presents nonlinear function. By using unilateral analysis method, the results show that the maximum net benefit is reached on condition that dY/dx is equal to Px/Py on the area with sufficiency of water source. After implementing economical irrigation norm that has been drawn from abovementioned results, water consumption is reduced 44m3 per hm2, whereas no more than 1% of the wheat yield is reduced.
出处
《中央民族大学学报（自然科学版）》
2003年第2期163-166,共4页
Journal of Minzu University of China(Natural Sciences Edition)
基金
国家九五攻关项目(96 006 02 03).
