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通过人工控制水肥等，研究了人工遮荫和林粮间作中的树木遮荫对农作物产量的影响。结果表明，人工遮荫与林粮间作树木遮荫对产量的影响相同。林粮间作田受树木阴影移动的影响，田间总会有一部分时间处于全日照或接近全日照的时间，因此应该采用“树木遮荫下的日均光强”来衡量树木的遮荫程度。研究表明，作物产量和生物量与光强存在着明显的线性关系，可用经验方程判断遮荫度与产量的关系，并可判断作物的喜光性。
By artificial control of water and fertilizer, we studied the effects of tree shading on crop yield in artificial shading and intercropping forest. The results show that artificial shading and intercropping of forest trees have the same effect on yield. The intercropping of forest and grain fields with trees is affected by the shadows of trees. There is always time when the field is in full or near full sunlight. Therefore, the shade degree of trees should be measured by the “average daily light intensity under shade of trees”. The results show that there is a clear linear relationship between crop yield and biomass and light intensity. The empirical equation can be used to judge the relationship between shade and yield, and to judge the hi-light property of crops.