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饲料牧草种子是宝贵的品种资源。为了保存品种资源,使种子不丧失生活力,并具有符合要求的发芽率和发芽势,则需要了解种子的寿命,以便有计划地分期分批进行种子更新。种子寿命是指种子在一定的条件下,能保持其生活力的平均年限。实际上每粒种子都有它一定的生存期限,但这一绝对长度目前尚无法测定。因此只能应用取样的方法,每隔一定时间从种子群体中取出一定的数量为代表,测定其存活率。当一个种子群体的发芽率降低到50％左右时,那么从收获后到半数种子存活所经历的时间,就作为该种子群体的寿命。种子
Feed forage seeds are a valuable variety resource. In order to conserve variety resources so that the seeds do not lose viability and have the desired germination rate and germination potential, the life of the seeds needs to be known in order for the seeds to be planted in batches in batches. Seed life is the average life expectancy of seeds under certain conditions. In fact, each seed has its own life expectancy, but this absolute length is not yet determined. Therefore, only the sampling method can be used. At regular intervals, a certain amount of seed population is taken as a representative to measure the survival rate. When the germination rate of a seed population is reduced to about 50%, the time elapsed from the harvest to the half seed survival is taken as the life span of the seed population. seed