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大豆由于具有根瘤固氮作用,因而具有特殊的需氮规律。在生育前期给予大量氮肥,根瘤的生长发育就要受到抑制,影响固氮能力,如氮肥不足,到大豆生育旺盛时期追肥不便,而其自身的固氮又不能满足对氮肥的需要,致使大豆生长发育不良,难以获得高产.为此.我们于1987～1989年在盆栽条件下,播种时施用缓效氮肥的方法探讨在苗期既不影响根瘤固氮,而生育盛期又能满足大豆对氮肥的需求。
Soybean has a special nitrogen requirement due to the effect of nodulation and nitrogen fixation. In the early stage of fertilization given a large number of nitrogen, nodules will have to be inhibited the growth and development, affecting the ability of nitrogen fixation, such as lack of nitrogen to fertilize the soybean during the fertile period inconvenience, and its own nitrogen can not meet the needs of nitrogen fertilizer, resulting in poor growth and development of soybeans , It is difficult to obtain high yield.Therefore, we applied the slow-release nitrogen fertilizer in potted condition from 1987 to 1989. The method of applying slow-release nitrogen fertilizer at seedling stage did not affect the nitrogen fixation of nodules at seedling stage,