It was observed that the rates of main stem growth and fruiting site formation decreased by over 30% when soil relative water content (SRWC) was lower than 60% as against control plantsj growth virtually ceased when SRWC fell below 40%.

• 花铃期土壤相对含水量在60%25以下时,棉花主茎平均日生长量和果节出现速率比不缺水的对照降低30%25以上; 土壤水分低于40%25时,生长基本停止。