我国1958年大跃进以来的实践证明,合理密植是提高单位面积产量,获得农业丰收的一项重要措施。因为合理的密植可以在增加农田单位面积上植株数目的条件下,增加光合作用的面积,充分有效地利用太阳光能制造有机物貭,并形成有利于植物生长的农田 小气候。

On the bases of observation data from various sources of the influences of seeding density on the microdimate in analyses the crop have cover been The made main results are as follows: 1. Within the crop cover the decrease i}; radiation and temperature in the vege- tative period is proportional to the logarithm of seeding density. 2. The soil moisture and the relative humidity of the air in the crop cover decrease (the former) or increase (the later) lineally with the increase of density of seeding. 3. The variation of wind velocity with density of seeding can be expressed approxi-mutely by this equation: u=u₀e^-fN, where U signfies the wind velocity within the crop cover; U₀ the velocity above the crop surface; N the density of seeding and f a parameter. 4. For each crop there is an optimum seeding density- that would lead to maximum yield.