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在直播造林和育苗中,常常见到同时期播种而出苗时间不一致,甚至有些后出土的幼苗与先出土的幼苗相差5——10天之久。这样就造成了幼苗生长的高矮不齐和缺苗现象,在一定程度上影响了苗木的产量和造林成活率。造林幼苗出土时间不一的原因很多,今就对应用种子检验上提点个人看法。目前种子品质检验的主要内容有种子发芽率、发芽势、纯度等项,根据种子发芽率与纯度两项指标确定种子等级,在生产实践中,往往只用种子发芽率计算播种量和推算出苗率。经验证明,这种方法是
In the live afforestation and nursery, it is often seen that the same period of sowing and emergence of inconsistent time, even after some of the unearthed seedlings and unearthed seedlings difference of 5 - 10 days long. This led to the height of seedling growth and lack of seedling phenomenon, to a certain extent, affected the yield of seedlings and afforestation survival rate. Reforestation of seedlings unearthed at different times for many reasons, now on the application of seed test points on the personal point of view. At present, the main contents of seed quality inspection are seed germination rate, germination potential, purity and other items. According to the two indexes of seed germination rate and purity, the seed grade is determined. In the practice of production, the seed germination rate is usually used to calculate the seeding rate and calculate the seedling emergence rate . Experience shows that this method is