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通过对两个棉花品种5个种植密度试验,系统观察了不同密度条件下棉花个体、群体的生长发育与产量建成情况。结果表明:以种植密度75000株/hm2,棉花个体发育比较充分,成铃数在975000个/hm2以上,10月20日吐絮率在80%以上,11月10日前达到95%,皮棉产量水平接近1500 kg/hm2。密度过低时,群体难以达到较高产量;密度过高时,个体发育不充分,结铃部位上移,吐絮期明显推迟,不利于正常收获和作物茬口衔接。
Through the five planting densities tests on two cotton varieties, the growth and development of cotton individuals and their population under different densities were systematically observed. The results showed that with the planting density of 75000 plants / hm2, cotton individuals developed more than 975000 / hm2, the rate of stubble was above 80% on October 20 and 95% before November 10, and the lint yield was close to 1500 kg / hm2. Density is too low, the group is difficult to achieve higher yield; density is too high, the individual development is not sufficient, the boll sites up, boll opening phase was delayed, is not conducive to the normal harvest and crop stubble convergence.