Effects of Straw Returning and Nitrogen Application Rate on Grain Yield and Nitrogen Use Efficiency of Winter Wheat
Han Mingming
Li Wenqian
Chen Jin
Li Yong
Abstract：In order to investigate the effects of straw returning and nitrogen application rate on the SPAD value of flag leaf after flowering,dry matter accumulation,nitrogen efficiency and yield of winter wheat variety Jimai 22 (JM22),the field experiment was conducted in 2015 to 2016,and the wheat yield and nitrogen efficiency were determined.The split block design was adopted in this study.The main plot was straw treatment including straw returning (S1) and no straw returning(S0).The subplot was nitrogen fertilizer treatment including four nitrogen fertilization rates of 0 (N1),180 kg/hm2 (N2),240 kg/hm2 (N3) and 300 kg/hm2 (N4) with the ratio of base to dress of 1 ∶ 1.The results indicated that straw returning obviously improved the SPAD value of flag leaf after flowering,and it increased with the increase of nitrogen application rate at the same period.Compared with the single nitrogen treatment,straw returning significantly increased the proportion of dry matter accumulation after anthesis with the increase amplitude of 0.24％ ～ 6.75％.Boosting the nitrogen application rate was contribute to the improvement of dry matter accumulation during the whole growing period.In short,straw returning with a moderate amount of nitrogen fertilizer was beneficial to improve the nitrogen efficiency,kernels per spike and thousand seed weight of winter wheat,thereby improve the grain yield.
Keywords：Winter wheatStraw returningNitrogen efficiencyNitrogen fertilizerGrain yield
Publication Date：2017-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 95-100,106 )