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田间试验结果表明 ,水稻、小麦产量随着施氮量的增加而增加 ,但单位氮素的产量、边际产量以及生产弹性系数、产投比均随着施氮量的增加而下降。稻、麦籽粒氮肥当季利用率均随着施氮量的增加而表现为先增后降 ,秸秆氮素利用率基本上呈上升的趋势 ,说明在该地区稻麦两熟制度中存在着氮素奢侈吸收现象。应用传统经济学和环境经济学方法求算出当地稻麦两熟的周年生态、经济施氮量分别为 2 81 .9和 3 3 6.3 kg/ hm2 。
The results of field experiments showed that the yield of rice and wheat increased with the increase of nitrogen application rate, but the unit nitrogen yield, marginal yield, production elastic coefficient and production / input ratio decreased with the increase of nitrogen application rate. The utilization rate of nitrogen and nitrogen in rice and wheat grains all increased at the beginning and then decreased with the increase of nitrogen application rate, and the nitrogen utilization efficiency of straw basically showed an upward trend, indicating that nitrogen and nitrogen existed in the rice and wheat double cropping system Sumptuous luxury absorption phenomenon. Using the methods of traditional economics and environmental economics, the annual ecological and economic nitrogen application rates of rice and wheat in the region were calculated to be 2 81.9 and 3 3 6.3 kg / hm2, respectively.