苗木的密度不仅是单位面积产量的基础,又是影响苗木质量的重要条件。密度过大,苗木之间相互拥挤,营养面积缩小,通风不良,光照不足。因而降低了苗木的光合作用和产物。则降低了苗木的质量。密度过小,不能保证单位面积上的产苗量,而且圃地容易滋生杂草,增加土壤水分和养分的消耗。合理的密度就能克服过密、过稀的缺点,获得壮苗丰产。 Seedling density is not only the basis of yield per unit area, but also affect the quality of seedlings an important condition. Density is too large, mutual crowding of seedlings, nutrient area reduced, poor ventilation, lack of light. Thus reducing the photosynthesis of seedlings and products. Then reduce the quality of seedlings. Density is too small, can not guarantee the amount of seedling per unit area, but also easy to breed weeds in the garden, increasing soil moisture and nutrient consumption. Reasonable density can overcome the shortcomings of too dense, too thin, strong seedlings yield.