一、绿肥对培肥改土的作用绿肥是有机肥料,它和粪肥、堆肥等有机肥料有一定的相同点,具有培肥地力、改良土壤、供给农作物营养等多方面的作用。但豆科绿肥作物,又具有一定的特点。豆科绿肥是最廉价的氮素来源,豆科植物的根瘤菌能把空气中的氮气固定到土壤里,供给农作物吸收利用。通常判定:豆科植物所含氮素, First, the role of green manure on soil fertility Green manure is organic fertilizer, and manure, compost and other organic fertilizers have some of the same point, with fertility, soil improvement, crop nutrition and other functions. However, leguminous green manure crops, but also has certain characteristics. Legume green manure is the cheapest source of nitrogen, rhizobium legumes can fix the nitrogen in the air to the soil, for the absorption of crops. Usually determine: legumes contain nitrogen,