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玉米的合理密植是根据生产条件和农田生态环境条件在单位面积上种植适当的株数,使群体发育和个体发育的矛盾取得协调,充分利用光、热、水分和矿物质营养,从而增加同化养分的有效积累,提高单位面积产量。合理密植增产的原因主要表现在两个方面。一是调整解决穗多、穗大、粒重三因素间的矛盾。由于穗子大小和粒重主要由品种遗传因素所决定,因而合理调整每亩穗数对提高产量起着决定性作用;二是充分利用单位面积的光能、水分和矿物
The rational close planting of corn is based on production conditions and farmland ecological environment conditions in the planting of appropriate number of units per unit area, so that the contradiction between population development and individual development to coordinate, make full use of light, heat, moisture and mineral nutrition, thereby increasing the assimilation of nutrients Accumulate effectively and increase yield per unit area. Reason for close planting and yield increase mainly in two aspects. First, adjust and solve the spike, spike, grain weight of the contradiction between the three factors. As the size and grain weight of the ear are mainly determined by the genetic factors of the variety, reasonable adjustment of the number of spike per acre is decisive for the improvement of yield. The second is to make full use of light energy, water and minerals per unit area