近些年来，我国紫花苜蓿种植面积不断扩大，但与美国、加拿大一些国家相比还相差很远。影响我国苜蓿种植的一个主要原因是种子不足。我国的种子产量非常低，一般在北方生长第二年的头茬紫花苜蓿每公顷生产种子只有 112.5～ 150公斤，而美国、加拿大等畜牧业发达的国家每公顷种 In recent years, the planting area of ​​alfalfa in our country has been continuously expanded, but it still lags far behind some countries in the United States and Canada. One of the main factors affecting the alfalfa cultivation in our country is the lack of seeds. China’s seed production is very low, the first annual growth in the north of the first crop of alfalfa only 112.5 to 150 kg per hectare seeds, while the United States, Canada and other developed countries, livestock husbandry per hectare species