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选用玉米品种郑单958和金海5号,设不同种植密度,研究阴雨寡照条件下种植密度对夏玉米叶面积、干物质积累及产量的影响。结果表明,在整个生育期,郑单958和金海5号群体叶面积指数(LAI)均随密度的增加而增大,但LAI增长率和单株叶面积逐渐减小,表明随着密度提高,LAI增加是单株叶面积减少和群体数量增加共同作用的结果。随着密度增加,两个品种单株干物质积累量均呈下降趋势。郑单958和金海5号在52 500株/hm2的密度下产量最高,分别为7 358.3 kg/hm2和7 016.7 kg/hm2。
The maize varieties Zhengdan 958 and Jinhai 5 were planted at different planting densities to study the effects of planting densities on leaf area, dry matter accumulation and yield of summer maize under the conditions of rain and oligozoospermia. The results showed that throughout the growth period, leaf area index (LAI) of Zhengdan 958 and Jinhai 5 increased with the increasing of density, but LAI growth rate and leaf area per plant decreased gradually, indicating that with the increase of density, Increased LAI is the result of a combination of reduced leaf area per plant and increased population size. With the increase of density, the accumulation of dry matter of two cultivars showed a downward trend. Zhengdan 958 and Jinhai 5 had the highest yields at 52 500 plants / hm 2, with 7 358.3 kg / hm 2 and 7 016.7 kg / hm 2, respectively.