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对杂交稻“特优６３”Ｎ素水平与物质生产关系的研究结果明确：①随施Ｎ量增加，叶片含Ｎ率提高，叶面积扩大，净光合率在未到行前随之提高，到行后随之下降。因而营养器官贮藏物质的积累和中后期干物质积累速率以适量施Ｎ的处理（本试验为亩施Ｎ１１ｋｇ）为最高，产量也最高。施Ｎ过多，颖花大量退化，穗粒数、结实率，千粒重下降；施Ｎ过少，穗少穗短，单位面积总颖花数显著减少。②叶片含Ｎ率与产量呈二次曲线关系，相关达显著，极显著水平，苞分化，孕穗和齐德期最适叶片含Ｎ率分别为４．３３％，３．０３％和２．８３％。叶片含Ｎ率可望作为经济合理施Ｎ的量化指标之一。
The results of the study on the relationship between the N level and the material production of hybrid rice “Te You 63” are as follows: (1) With the increase of application amount of N, the N content of leaves increased and the leaf area increased. The net photosynthetic rate After the trip down. As a result, the accumulation of nutrients in vegetative organs and the accumulation rate of mid-late dry matter were the highest with the highest N application rate (N11kg in this experiment). N applied too much, a large number of spikes degeneration, spikelets, seed setting rate, grain weight decreased; N is too small, short spike spike, the total number of spikes per unit area decreased significantly. (2) The leaf nitrogen content and the yield showed a quadratic curve, the correlation reached significant, extremely significant level, bud differentiation, booting and Qi De optimal leaf N content were 4.33%, 3.03% and 2.83 %. N rate of leaves is expected to be used as a quantitative and economical indicator of N fertilization.