黑龙港地区小麦玉米最佳施肥灌水量的经济分析(英文)

An Economic Analysis of Optimum Nitrogen and Water Application in the Heilonggang Plain

在黑龙港半干旱地区,以每公斤氮肥4元、每毫米灌水2元的成本计算,每公顷土地最大净收益为:夏玉米3485.4元,冬小麦11439.2元,相应的每公顷产量为:夏玉米4943.4kg,冬小麦8138.8kg,相应冬小麦灌水量为281.9mm,这比当地实际平均灌水量高约100mm。灌溉成本的变化对最佳灌水量影响不大。

In the semi-dry land of the Heilonggang Plain(Hebei Lowland Plain), the maximum net return is￥3 485.4/ha for summer com and￥11 439.2/ha for winter wheat under the ￥4/kg N-fertilizer price and￥2/mm irrigation cost, the corresponding yields are 4 943. 4kg/ha for corn and 8 138.8kg/ha for wheat;the wheat irrigation rate for the maximum net return under￥4/kg N-fertilizer price and￥2/mm irrigation cost is 281. 9mm, this is almost 100mm higher than the local actual current irrigation rate for wheat;the changes of irrigation cost has little effect on the maximum net return irrigation rate; the N-fertilizer application rates for maximum net return of wheat and corn are similar to the average local current rates, but some farmers appear to be using too much N-fertilizer and some appear to be using too little.