论文部分内容阅读
以西农979为供试材料,在秸秆还田条件下设置5个不同的冬小麦施氮水平进行田间试验,分析不同处理下冬小麦产量及产量构成因素、收获后土壤硝态氮以及冬小麦子粒蛋白质含量。在秸秆还田条件下随施氮量的增加,冬小麦子粒产量、生物学产量、有效穗数和千粒质量均呈先增后降趋势,子粒产量、生物产量和公顷穗数在施氮262.5千克/公顷达到最大,千粒质量在施氮175千克/公顷达到最大。氮素回收效率、氮肥利用效率均随施氮量的增加而降低,氮素收获指数随施氮量的增加先增后降,在施氮175千克/公顷时达
Five different winter wheat N application rates were set up in field experiments with Xixin 979 as test material. The yield, yield components, soil nitrate nitrogen and grain protein content of winter wheat under different treatments were analyzed. Under the condition of returning straw to field, the grain yield, biological yield, effective panicle number and grain quality of winter wheat increased first and then decreased with the increase of nitrogen application rate. The grain yield, / Hectare reached the maximum, the quality of 1000 grains reached the maximum nitrogen fertilizer 175 kg / ha. Nitrogen recovery efficiency and nitrogen use efficiency decreased with the increase of nitrogen application rate. Nitrogen harvest index increased first and then decreased with the increase of nitrogen application rate. When nitrogen application rate reached 175 kg / ha