大豆对氮素的需要是相当多的,没有足够的氮素供给,大豆难以获得高产。但是,在生产实践中,有些人认为,大豆根瘤菌能固氮,可以少施氮肥或不施氮肥,只要重视磷肥的施用就可以了。因而时常出现因氮素供给不足,而遭致大豆减产的实例。所以,分析大豆的氮素营养对提高产量十分重要。 Soybean needs a considerable amount of nitrogen, not enough nitrogen, soybean difficult to obtain high yield. However, in production practice, some people think that Rhizobium soybean nitrogen fixation, nitrogen fertilizer can be less or no nitrogen fertilizer, as long as the emphasis on the application of phosphate fertilizer on it. As a result, there have been frequent instances of underproduction of soybean due to insufficient supply of nitrogen. Therefore, analyzing the nitrogen nutrition of soybean is very important to increase the yield.