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被誉为“牧草之王”的紫花苜蓿(Medicago (?)ativa L.,以下简称苜蓿)一直是美国的最大饲料作物.自上世纪中叶苜蓿在美国西南部加利福尼亚洲首次引种成功后,100多年来,美国政府高度重视苜蓿生产并责成和组织有关部门和人士不断向世界各地搜集苜蓿种质资源,广泛筛选、改良和利用引种材料,扩大面积,改善生产条件,努力提高单产和总
Alleged Medicago (?) Ativa L., alfalfa, has long been the largest feed crop in the United States, and since the mid-century when alfalfa was first introduced in California in the southwestern United States more than 100 years According to the report, the U.S. government attaches great importance to alfalfa production and instructs and organizes relevant departments and individuals to continuously collect alfalfa germplasm resources from all over the world, extensively screen, improve and make use of introduced materials, expand the area, improve production conditions and strive to increase yields and total output