每个树种在不同的地区,大都有它最适宜的播种量。不同的播种量,对苗木的产量与质量往往有很大的影响,若播种量过大,不但浪费种子,且苗木营养面积缩小,生长发育不良,播种量过小,则产苗量少,浪费土地和劳力,加大苗木成本。为了探求播种量与苗木质量、产量之间的关系,我们选用油松、侧柏、刺槐、中槐等四个造林树种,分别采用不同的播种量, 通过1956— Each tree species in different regions, most of it has the most appropriate seeding rate. Different sowing rates have great influence on the yield and quality of nursery stock. If the sowing rate is too large, not only the seeds are wasted, but also the nutrition area of ​​nursery stock is reduced and growth is poor. If the sowing rate is too small, Land and labor, increase seedling costs. In order to explore the relationship between sowing quantity and seedling quality and yield, we selected four afforestation species of Pinus tabulaeformis, Platycladus orientalis, Robinia pseudoacacia, Zhonghuai, etc., using different seeding rates,