栽培牧草的营养价值,在很多方面取决于牧草的品种。在确定牧草的组成时,要考虑到气候、土壤条件、牧草的产量、抗践踏能力、适口性及在旱、涝等条件下的生存能力。由某些多年生牧草(禾本科和豆科)组成的混合牧草比单种牧草能获得较高的产量,因为这样利用土壤贮存营养元素的效率较高。当集约化利用草地时,豆科牧草除白三叶外,在大量施氮肥的第2～3年产量下降。因此,当长期利用的草地并施以大量氮肥 The nutritional value of forage grasses depends in many ways on the forage species. In determining pasture composition, taking into account climate, soil conditions, pasture production, anti-trampling ability, palatability and in drought, waterlogging and other conditions of the viability. Mixed forages from some perennial forages (grasses and legumes) yield higher yields than single forages because of the higher efficiency of using soil to store nutrients. When intensive use of grassland, leguminous grass except white clover, in a large number of nitrogen fertilizer in the second to third year of decline. Therefore, when long-term use of grass and applied a large amount of nitrogen fertilizer