很多豆科牧草种子,在适宜的水、热条件下,由于种皮的不透水性,不能吸水膨胀而长期处于干燥坚硬状态,这些种子称硬实种子,俗称“铁豆”。一般约占种子重量的10%～30%,有的高达70%～80%,因此,为保证播种质量,在播种前必须进行处理,防止生产上造成出苗不齐或不出苗的现象。常用 A lot of legume forage seeds, under suitable water and heat conditions, can not swell and long-term dry and hard due to the impermeability of the seed coat. These seeds are called hard seeds, commonly known as “iron beans.” Generally about 10% to 30% of seed weight, and some as high as 70% to 80%, therefore, in order to ensure sowing quality, must be dealt with before sowing, to prevent the phenomenon of emergence or lack of emergence. Commonly used