一、前言紫花苜蓿(Medicago sativa L.)和黄花苜蓿(M.falcata L.)都是豆科苜蓿属的优良牧草,紫花苜蓿产量高,品质好,种植面积在栽培牧草中居首位,但在我国北方严寒地区有时越冬困难。黄花苜蓿产量中等,粗蛋白质含量接近于紫花苜蓿,但粗纤维含量比较低,在我国北方地区一般能安全越冬。 I. Introduction Alfalfa (Medicago sativa L.) and alfalfa (Medicago sativa L.) are excellent forage legume Medicago sativa, alfalfa high yield, good quality, planting area in the top priority in the cultivation of forage grass, but in our country Northern winter is sometimes difficult winter. The yield of alfalfa is medium and its crude protein content is close to that of alfalfa, but its crude fiber content is relatively low. It is generally safe to wintering in northern China.