不同氮肥水平下生物炭施用对杂交中籼稻产量的影响

Effects of Biochar Application on Yield of Medium Indica Hybrid Rice Under Different Nitrogen Levels

2016—2017年,以杂交中籼稻品种Y两优1号和珞优9348为材料进行大田试验,研究生物炭施用(C0:0 t/hm^(2)、C1:20 t/hm^(2))对不同氮肥水平(N0:0 kg/hm^(2)、N1:90 kg/hm^(2)、N2:150 kg/hm^(2))下杂交中籼稻的产量、产量构成、干物质和收获指数的影响。结果表明,施用生物炭对杂交中籼稻产量、单位面积穗数和每穗粒数没有产生明显影响,但在一定程度上提高了结实率、千粒重、齐穗期或成熟期地上部干物质量,而明显降低了收获指数。增施氮肥对杂交中籼稻增产显著,有利于提高单位面积有效穗数、每穗粒数、千粒重、齐穗期和成熟期地上部干物质量,而不利于提高结实率和收获指数。

To study the effects of biochar application(C0:0 t/hm^(2),C1:20 t/hm^(2))at different nitrogen levels(N0:0 kg/hm^(2),N1:90 kg/hm^(2),N2:150 kg/hm^(2))on yield,yield components,aboveground biomass and harvest index of medium indica hybrid rice,a field experiment was carried out in 2016 and 2017 with the medium indica hybrid rice varieties Y Liangyou 1 and Luoyou 9348 as experimental cultivars.The results showed that the biochar application had not a remarkable effect on yield,panicle number per unit area and spikelets per panicle of medium indica hybrid rice,however,it increased to some extent the seed-setting rate,1000-grain weight and shoot dry matter at full heading stage or maturity stage,and decreased remarkably the harvest index.The nitrogen application significantly increased the yield of medium indica hybrid rice,and it is favorable to increase the panicle number per unit area,spikelets per panicle,1000-grain weight and shoot dry matter at full heading stage and maturity stage,but it is unfavorable to increase the seed-setting rate and harvest index.