不同耕作方式下水稻品种吉优716产量及氮素吸收利用对氮肥运筹的响应

Response of yield，nitrogen uptake in Jiyou716 to nitrogen management under different tillage patterns

关键词:  耕作方式  施氮量  施氮方式  氮素利用  产量  水稻

Key words:  tillage pattern  N fertilizer  N fertilizer mode  nitrogen utilization  yield  rice

摘要:

研究在不同耕作方式和氮肥运筹模式下水稻产量形成及氮素吸收利用特点，为不同耕作方式下水稻氮肥的合理运筹提供理论依据。以吉优716为试验材料进行大〖JP2〗田试验，研究常耕与免耕2种耕作方式下3种施氮量（N0、N1、N2）和两种施氮方式（F1、F2）水稻产量及氮素吸收利用的变化。结果表明:免耕水稻和常耕水稻产量、干物质积累量和氮素积累利用对施氮水平运筹的响应基本一致，但对施氮方式运筹响应呈现不一致。随着施氮量的增加，水稻产量、干物质积累量和氮素积累量也随之升高，而干物质生产效率和氮肥农学利用率下降，穗部干物质比例随着施氮量的增加有减少的趋势；免〖JP〗耕和常耕下，重施穗肥有利于提高干物质积累量和氮素积累量；产量响应表现相反，免耕下重施穗肥有利于产量的提高，而常耕下重施基蘖肥有利于产量的提高。

Abstract:

Characteristics of rice yield formation and nitrogen uptake under different soil tillage patterns and nitrogen fertilizer management patterns were studied, which provided theoretical basis for rice rational fertilizer application under different tillage systems. With Jiyou716 as materials for field experiments，change of yield，nitrogen uptake in rice at three N rates(N0，N1，N2) and two fertilizering patterns(F1，F2) under no tillage and conventional tillage were studied. The results indicated that response of yield and nitrogen uptake of rice to nitrogen amount were basically similar under no tillage and conventional tillage，but inconsistent to nitrogen fertilizering pattern. With N rate increasing, the yield，dry matter accumulation and N accumulation of rice increased，and N production efficiency，dry matter harvest index and N agronomy efficiency decreased. Heavy earring fertilizer was better for N accumulation and dry matter accumulation increase under no tillage and conventional tillage. But inconsistent response for grain yield. Heavy earring fertilizer was in favor of yield increase under no tillage while heavy basic fertilizer and tillering fertilizer was better for yield increase under conventional tillage.