硅基包膜控释肥对水稻产量形成、氮素吸收及氮肥利用率的影响

摘要

One continuous two-year field trial was conducted to study the effects of controlled-release fertilizers coated by silic-based materials on the yield components , nitrogen absorption and nitrogen use efficiency of rice , and analyzed the relation-ships of N harvest index with the yield, nitrogen content and nitrogen adsorption.The results showed that one-time basal applica-tion of controlled-release fertilizers coated by silic-based materials could get better effect, the rice yield was the highest in the treatment of applying 80% controlled-release fertilizer, the rice yields were 16661 kg/hm2 , the yield difference was not significant with time fertilization ( the optimal application treatment and the local conventional application treatment ) .Compared with the optimal application fertilization treatment , application of coated urea could significantly improve the apparent nitrogen use efficiency of rice.The rice nitrogen absorption had a positive relationship to the rice yield, there didn’ t exist obvious relationship between grain yield and nitrogen content , the N harvest index significantly decreased with the increasing of the biomass of rice straw, the N adsorption of rice straw and the total N adsorption .%通过连续2年早、晚双季稻的大田试验，研究了硅基包膜控释肥对水稻产量、产量构成因素、籽粒和秸秆氮素吸收及氮肥利用率的影响，并分析了水稻产量、含氮量、吸氮量和氮素收获指数之间的关系。结果表明：一次性施用硅基包膜控释肥的效果较好，特别是施用80％量控释肥处理的水稻年均产量最高，达到16661 kg／hm2，与分次施肥（优化施肥和当地习惯施肥）处理的产量差异不显著；与优化施肥处理相比，施用控释肥能显著提高水稻的表观氮素利用率；水稻籽粒吸氮量与产量呈正相关，籽粒含氮量与产量无相关性，氮收获指数随着秸秆产量、秸秆吸氮量、总吸氮量的增加而显著减小。