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研究了氮素营养对杂交水稻 51 8的干物质和氮素分配的影响,结果表明:在营养生长期高氮肥用量显著增加了叶片干物质重。叶片干物质的分配量随着叶片氮含量的减少而减少。与干物质相比,在营养生长早期叶片氮素的分配量高,并且变化很小。但从幼穗分化开始叶片氮素的分配量可能因叶片、茎和颖穗发育的竞争而显著减少。采用Stanford模型估计和预测了水稻氮肥的需要量,发现Stanford模型可作为我国南方水稻生产施用氮肥的一个实用工具。
The effects of nitrogen nutrition on the dry matter and nitrogen distribution of hybrid rice 51 8 were studied. The results showed that the high nitrogen fertilizer application significantly increased the dry matter weight of leaves in vegetative growth stage. Leaf dry matter distribution decreased with the reduction of leaf nitrogen content. Compared with the dry matter, leaf nitrogen allocation was high at the early stage of vegetative growth and changed little. However, the distribution of nitrogen in leaves from the start of panicle differentiation may be significantly reduced due to the competition of leaf, stem and panicle development. Using the Stanford model to estimate and predict the nitrogen requirement of rice, Stanford model can be used as a practical tool for applying nitrogen fertilizer to rice production in southern China.