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对 4种不同种植密度棉株生长发育动态进行田间系统观测 ,并做回归相关分析 ,结果表明棉株出苗 18～83d ,叶龄随生育天数增加而增长 ,株高、倒四叶宽、果枝叶和果枝数、现蕾和开花结铃数随叶龄的增加而增长 ,呈极显著的正相关。密度在 14 .2万～ 2 3.1万株·hm-2 的范围内 ,籽棉产量随密度、总铃数增加而提高 ,呈极显著的正相关。对早熟棉花品种单产皮棉 2 2 5 0kg·hm-2 以上、密度 2 2 .5万～ 2 4 .0万株·hm-2 棉田 ,提出以叶龄为核心的动态生育指标
The growth of 4 different planting density cotton plant growth and development of the field observations and regression analysis showed that the cotton seedling emergence 18 ~ 83d, leaf age increased with the growth of days growth, plant height, inverted four leaf width, fruiting branches and leaves And the number of fruit branches, budding and flowering bolls increased with leaf age, showed a very significant positive correlation. Within the range of 142,000-231,000 plant-hm-2, the seed cotton yield increased with density and total number of bolls increasing, showing a significant positive correlation. On the cotton varieties with precocious cotton yield more than 2250kg · hm-2 and density of 2200 ~ 24000 · hm-2 cotton fields, the dynamic growth index with leaf age as the core