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黄豆是一种固氮作物,根系上有很多根瘤,能把土壤中游离的氮索吸收储存起来,供给黄豆生长。根瘤的残体和植株的残根落叶,还能增加土壤的有机质。据试验,一般一亩黄豆每年大约可归还土壤鲜
Soybean is a nitrogen-fixing crop with many nodules on the roots that absorb the free nitrogen in the soil and store it in soybeans for growth. Nodule residues and plant roots and leaves, but also increase soil organic matter. According to the test, generally about 1 mu of soybean can return fresh soil every year