氮肥运筹对Y两优1号产量和生物量影响的探讨

【研究目的】探讨不同施氮量和不同施氮时期运筹对超级杂交稻籽粒产量及产量构成的影响。【方法】以超级杂交稻Y两优1号为试验材料，设计不同施氮量和不同施氮时期运筹2个田间试验进行研究。【结果】产量（y1）、穗长（y2）、穗总粒数（y3）均与施氮量（x）呈极显著的二次抛物线相关；每公顷穗数与施氮量显著线性相关。超级稻在各生育时期的生物量随施氮量增加而增加；随着水稻生育期的进程施氮量对生物量的促进作用更加明显；相同基-穗施氮比例（80-20）不同施氮量处理各个时期生物量变化趋势相似，后期生物量增加速度快的处理其产量普遍较高。【结论】该地区Y两优1号产量最高的施氮量为252 kg.hm-2；在施氮量为180 kg.hm-2条件下，基-穗施氮比例60-40和基-蘖-穗-粒施氮比例10-50-25-15的产量达到最高,分别为11649 kg.hm-2和11624 kg.hm-2。

Discussion of Effect of Nitrogen Application on Biomass and Production of Y Liangyou 1

【OBJECTIVE】Effect of different N-fertilizer levels and different N-fertilizer ratio on actual yield and yield components of super hybrid rice was studied 【METHOD】Two field experiment about different N-fertilizer levels and different N-fertilizer ratio were designed through super rice Y liangyou No?1 was experiment material 【RESULTS】 It was significantly secondary correlated between yield, ear length, grain number per panicle and nitrogen application rate (p < 0.01) and linear correlated between panicle number per ha and nitrogen application rate (p<0.05). In the amount 180 kg?hm-2 of nitrogen application, the production was reached 11649 kg?hm-2 and 11624 kg?hm-2 for 60-40 of base-panicle N fertilization and 10-50-25-15 of base-tillering-panicle-granular N fertilization respectively..Rice biomass was increased with N-rate increasing in different period; The effect of biomass promoted by N-rate was especially obviously with the progress of rice growth; Rice biomass change trends were similarly at different stage in different N-rate under same base-panicle (80-20) N-ratio. Yield of super hybrid rice was generally higher when rice biomass increased great in late period. 【CONCLUSION】252 kg?hm-2 was the N fertilizer rate when the yoeld of Y liangyou No. was highest. In the amount 180 kg.hm-2 of nitrogen application, the production was reached 11649 kg.hm-2 and 11624 kg?hm-2 for 60-40 of base-panicle N fertilization and 10-50-25-15 of base-tillering-panicle-granular N fertilization respectively.