氮肥不同追施时期对粳稻产量和蛋白质含量的影响

Effect of Different N Supplying Dates on Yield and Content of Protein in Japonica Rice

以豫粳6号为材料,设7个追肥时期,研究不同追氮时期对粳稻产量及其构成因素、籽粒中蛋白质含量的影响规律。结果表明：不同追氮时期对粳稻籽粒中蛋白质含量和产量有显著的影响,华北沿黄地区生态条件下,水稻秧苗移栽后50-55 d（8月5-10号）追施氮肥,既能获得最高的水稻产量,又能适度提高子粒中蛋白质的含量,增加穗数是产量提高的主要原因;水稻生长前期（8月10号以前）追施氮肥,随追氮时间的推移,水稻产量与蛋白质的含量同步提高;随着追氮时期的后移（8月10号以后）,水稻籽粒中蛋白质的含量呈上升趋势,但产量却逐渐下降。

Yujing 6 was used in this experiment. Nitrogen supplying was done on the 7 different dates. The effect of yield and its components of Japonica rice,content of protein in seeds by different nitrogen supplying dates were analyzed. The results showed that the effect of content of protein in seeds and yield of Japonica rice by different Nitrogen supplying dates was significant. On the Huabei ecological condition along Yellow-River area, Nitrogen supplying was done on 50 -55 day after seedling transplant （about 5 - 10 August）. The best yield and a proper content of protein were obtained. The main reason was to increase of panicle number. If Nitrogen supplying date was the prophase of rice growth （before 10 August） ,rice yield and protein content were synchronously increased along with its advance. Following the postponement of Nitrogen supplying date （after 10 August） ,the content of protein in seed presented climbing trend and rice yield was on the contrary.