紫花苜蓿是深根性多年生优质豆科牧草 ,号称“牧草之王” ,其耐旱、耐寒、耐盐碱、耐瘠薄、适应性强、产量高、品质优、耐频繁刈割持久性好、清除田间原有杂草、改土培肥及经济效益高等特点[1] 。它是世界上分布最广、最古老的栽培牧草 ,也是我国种植面积最大、历史最长的人工 Alfalfa is a deep root perennial superior quality leguminous forage, known as the “king of forage”, its drought, cold, salt, barren, adaptable, high yield, good quality, good resistance to frequent cutting, removal The original weeds in the field, soil improvement and higher economic efficiency of fertilizer [1]. It is the world’s most widely distributed, the oldest forage grass, but also China’s largest acreage, the longest history of artificial