施氮时期对寒地水稻产量构成因素的影响

The effect of nitrogen application time on yield factor in cold region

不同时期施氮对水稻产量构成因素的试验研究表明,施氮时期对穗数型水稻有效穗数影响显著,有效穗数与产量有很好的相关性(r=0.9770)。千粒重是影响其产量的主导因子,而对结实率影响不大。结实率是影响大穗型水稻产量的主导因子,施氮时期对其结实率影响差异显著,对千粒重影响差异不显著。

The research results indicated that the effect of nitrogen application time on effective spike formation of multiple-spike variety was significant, but for the big-spike variety, this effect was not significant. There is a good relationship between effective spike and yield. The effects of nitrogen application time on seed rates and 1 000-grain weight of two rice varieties were completely different. Seed rate is the leading factor of big-spike rice, whereas 1 000-grain weight is the leading factor of multiple-spike rice .