氮素营养对水稻干物质和氮分配的影响及氮肥需求量

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。

Effect of nitrogen applications on dry matter and nitrogen partitioning in rice and nitrogen fertilizer requirements for rice production

The present study evaluated the effects of nitrogen nutrition on dry matter and N partitioning in hybrid rice 518. Higher N application significantly increased dry matter partitioning of leaf at the vegetative stage. Partitioning of dry matter to leaves decreased as the N concentration in the leaves (LNC) decreased. Leaf partitioning of absorbed N, compared to dry matter, was higher and varied little during early vegetative growth, but varied greatly from panicle initiation onwards, probably due to competition for N among leaves, stem and the developing panicle. In this study, the Stanford model was selected for evaluating and predicting N fertilizer requirements for rice production. The Stanford model might be a useful tool for predicting average N fertilizer requirements for rice production in south China.