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有人认为,大豆根瘤菌具有固氮能力,只要增施磷钾肥就行了。其实不然,大豆从分枝开始进入营养生长和生殖生长并进阶段,这个时期对氮素营养需要量很大,大豆根瘤菌所固定的氮远不能满足大豆生长的需要。因此,在大豆进入分枝到初花期间,适时供应速效氮肥,对提高产量具有重大作用。在追肥时,要注意以下几点:
Some people think that soybean rhizobia nitrogen fixation capacity, as long as the increase of phosphorus and potassium on the line. In actual fact, soybeans from the branches began to enter the vegetative and reproductive growth and advanced stage, this period of great demand for nitrogen nutrition, soybeans fixed nitrogen far can not meet the needs of soybean growth. Therefore, the soybean into the first flowering branch, the timely supply of quick-acting nitrogen fertilizer, to increase production has a significant role. In the dressing, we must note the following points: