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过去常用密度试验、消光系数、叶向值(株型)来确定玉米品种的最适种植密度,但因密度试验相当繁琐,消光系数、叶向值法的精度也较差,所以难以同产量指标结合起来。1989年笔者在做库源关系试验时发现,在最适密度时,成粒率和库源比值趋于“一定值”(暂简称为“一定值”规律),这为找到一种确定品种最适密度的简单实
In the past, density test, extinction coefficient and leaf direction value (plant type) were used to determine the optimal planting density of maize varieties. However, due to the cumbersome density test and the poor extinction coefficient and leaf value method, it is difficult to compare with the yield index Combined. In 1989, when I did the test of the relationship between source and sink, I found that at the optimum density, the ratio of granulation rate to the source of the source tends to be “a certain value” (temporarily referred to as the “certain value” rule) The density of simple real