不同时期干旱胁迫对棉花生长和产量的影响Ⅱ棉花生长发育及生理特性的变化

在棉花生育中、后期缺水会使株高降低,果枝数、果节数、铃数减少,铃期变短,脱落增加,导致产量下降。随土壤含水量降低,棉叶水势下降,水分饱和亏上升,叶绿素含量降低,蒸腾强度减弱。叶片水分饱和亏与土壤含水量及叶片蒸腾强度具有高度相关关系,可用作反映棉叶水分状况、指导灌溉的诊断指标。

Effect of Drought Stress on Cotton Growth and Lint Yield at Different Growing Stage II.The Change of Cotton Growth and Physiological Characteristicsto Water Stress

It was observed that the plant height,numbers of sympodium branch and node,and also boll were decreasing and boll period was shortening and numbers of bud and boll falling were increaing along with the soil drought in the middle and later stages of cotton growing,which lead to yield reducing.There were linear increases in water potential,transpiration rate,chlorophyll contents of cotton leaves as soil moisture deficit increased.The result can also indicate that water saturation dificiency were correlated positively with both soil moisture content and transpiration rate,which may be an index for irrigating.;