棉花调亏灌溉效应研究

Effects of water deficit on yield and yield components of cotton

盆栽试验研究棉花调亏灌溉效应结果表明 ,棉花苗期为水分亏缺最佳时期 ,土壤含水量应维持在田间持水量的 5 0 %～ 5 5 % ,吐絮期维持在田间持水量的 5 0 %左右 ,蕾期维持在田间持水量的 6 5 %～ 70 % ,花铃期是棉花生长关键期 ,其土壤含水量应维持在田间持水量的 75 %左右 ,适当降低土壤含水量有助于提高棉株蕾铃数量 ,可减少蕾铃脱落。

The effects of water deficit and deficit degree at different growing stages of cotton on yield and yield components were studied by two years' pot experiments. The results show that the yield of cotton is improved when water deficit is imposed at seedling and boll opening stages, while the yield is significantly reduced by water deficit during the bud and flowering stages. The optimum water content levels are 50%～55% of field capacity at seedling stage, 65%～70% at bud stage,75% at flowering stage and 50% at boll opening stage of cotton. Reasonable control of the soil water contents can reduce the rate of bud and boll drop.