水稻营养生理的研究,国内外已有许多报导。世界各地种稻条件千差万别,氮肥作为底肥和在分蘖期前施用,似乎已为大多数人所接受。生产实践证明,水稻前期缺乏氮肥,生长发育不良,植株矮小,分蘖少,群体发展不足,产量低。若施氮过多,群体过度扩展,带来徒长、倒伏、病虫危害等不良后果。且施用过多的氮肥,氮素利用率下降,不能充分发挥肥效,还会导致环境污染。因此,合理施用氮肥,是夺取水稻高产的重要措施之一。 Rice nutrition physiology research, there are many reports at home and abroad. Varieties of rice vary widely across the world, with nitrogenous fertilizer applied as a base fertilizer and applied before tillering times, and appear to be acceptable to most people. Production practice has proved that the lack of nitrogen fertilizer in the early rice, poor growth and development, short plants, fewer tillers, population development, low yield. If too much nitrogen, the group over-extended, resulting in unfavorable growth, lodging, pest damage and other adverse consequences. And excessive nitrogen fertilizer, nitrogen utilization decreased, can not give full play to fertilizer, but also lead to environmental pollution. Therefore, the rational application of nitrogen fertilizer is one of the important measures to seize high yield of rice.