不同种植密度对棉花生育动态及产量的影响

Effect of Different Planting Density on Growth Trends and Yield of Cotton

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 。

After comprehensive observing growth trends and yield of cotton planted in 4 different density, and analyzing regression correlativity, the result shows that leaf age increased with growth period prolonged during seedling time about 18～83days, such characteristic increased with leaf age adding as plant height, width of reciprocal 4th leaf, number of fruit branch and its leaves, number of square and boll, and all of relationship above was very significant positive correlativity. Lint yield increased with planting density and total number of bolls adding in condition of 14.2×10 4～23.1×10 4 plants·hm -2 density, their relationship was very significant positive correlativity too. As to cotton field where grew rare ripe varieties with density of 1.5×10 4～1.6×10 4·hm -2 to get 1 500 kg·hm -2 lint yield, it was put forward that leaf age can be selected as center guideline for growth trends.