关键词: 粳稻, 氮肥用量及氮肥配置, 产量, 产量构成因素

Abstract: [Objective] The effects of the total amount of nitrogenous fertilizer and nitrogenous allocation on yield and yield components of japonica rice were researched. [Method] Nitrogen fertilizer dosage at different stages, such as the amount of nitrogen at ES, the amount of nitrogen at MS and the amount of nitrogen at LS, the application time of the regulating N-fertilizer(RF) and hill spacing(HS) on yield and yield components of japonica rice in cold area were studied in detail by using multiple factors quadratic rotational-regressive-orthogonal combination design. The conventional japonica rice variety ‘Kengjiandao 10’ was used in this experiment. [Results] The results showed that there was the optimum value between total amount of nitrogenous fertilizer and nitrogenous allocation(pure nitrogen was about 126 kg/hm²). The optimum value also existed between ratio of the amount of nitrogen at LS and yield(pure nitrogen was about 10 kg/hm²). [Conclusion] To some extent, increasing the total amount of nitrogenous fertilizer in a certain range could improve panicle per unit area and grain number per spike, and nitrogenous allocation had great influence on increasing rice output. So as to achieve high yield, increasing ratio of amount of nitrogen fertilizer at ES can improve panicle per unit area with the total amount of nitrogen fertilize unchanged and decrease the ratio of amount of nitrogen at MS was also can improve yield of japonica rice.

Key words: japonica rice, N-fertilizer and nitrogenous allocation, yield, yield components