为了满足用油松一年生苗造林的需要,我场苗圃地从1972年到1975年连续四年培育了油松一年生苗,逐渐摸索到一些经验。实践证明,用一年生苗比二年生苗造林成活率高,缩短了苗木培育期,提高了土地利用率,不仅苗木产量高,而且没有多头双叉苗,育苗成本大大降低(和培育二年生油松苗成本最低的1965年比较,二年生苗亩产12万株,百株成本为0.157元,而一年生苗的百株成本仅0.117元)。我们觉得,培育出当年生油 In order to meet the need of afforestation with Pinus tabulaeformis one year, my nursery nurtured the annual seedling of Pinus tabulaeformis for four consecutive years from 1972 to 1975, and gradually gained some experience. Practice has proved that the annual survival rate of more than two years of afforestation survival rate, shortened the seedling cultivation period, increased land utilization, not only high yield nursery stock, and no long double-leaved seedlings, nursery costs greatly reduced (and cultivate the lowest cost of biennial pine seedlings In 1965, the annual yield per mu was 120,000, the cost per hundred was 0.157 yuan, and the cost per 100 plants per year was only 0.117 yuan. We feel that we have fostered the generation of oil that year