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1.固氮作用豆科绿色植物,在其根部有根瘤,其上含固氮菌。这种菌能固定空气中游离的氮气,成为作物可吸收的有机氮化物,为豆科绿肥生长提供了氮素。所以种植豆科绿肥,只需在苗期施少量氮肥,但要早施磷肥,以磷促氮,绿肥的地上部分翻耕到土中后,在土壤微生物的作用下,逐渐分解,为后茬作物提供了丰富的养分。据测定,1亩绿肥如紫云英,一般可产25000公斤鲜草,其中约含有氮素10公斤,相当于40担优质猪厩肥。
1. Nitrogen fixation legumes green plants, root nodules in its roots, containing nitrogen-fixing bacteria. This bacterium fixes the free nitrogen in the air and becomes a crop-absorbable organonitride that provides nitrogen for the growth of legume green manures. Therefore, planting legume green manure, only a small amount of nitrogen fertilizer applied in the seedling stage, but to early application of phosphate fertilizer, phosphorus and nitrogen, green manure plowed into the ground above the soil, under the action of soil microorganisms, gradually decomposed for the stubble Crops provide a wealth of nutrients. It has been determined that one mu of green manure, such as Astragalus sinicus, can generally produce 25,000 kilograms of fresh grass, which contains about 10 kilograms of nitrogen, equivalent to 40 pigs of high-quality pig manure.