不同施氮水平对水稻产量、吸氮量及土壤肥力的影响

Effects of Different Nitrogen Applications on Grain Yield and Soil Fertility

[目的]研究不同施氮量对水稻产量、吸氮量、土壤肥力情况的影响。[方法]通过大田定位监测和分析,研究上海郊区沟干泥水稻土不同施肥处理对水稻产量、吸氮量及土壤肥力的影响。[结果]常规施肥处理产量与减量处理作物产量差异不显著(P>0.05),生物量高于减量施肥,但籽粒比重减少;吸氮量高于减量施肥,种植前后土壤氮含量变化差距不大。[结论]减量施肥不会降低土壤后续生产力。

[Objective]The research aimed to study the effects of different nitrogen applications on grain yield,nitrogen uptake and soil fertility.[Method] Based on the field experiments and analysis,the effects of N fertilizer on its grain yield,absorption contents of nitrogen and soil fertility were studied.[Result] The results indicated that the conventional fertilizer treatment and decrement treatment had insignificant difference on the grain yield（P〉0.05）.The biomass of conventional fertilizer was higher than the latter but the seed rate was lower and the absorption content of nitrogen was higher than the latter.The soil total N content after planting changed a little then before.[Conclusion] Reducing the fertilizer rate would not influence soil subsequent productivity.