Abstract
In rainy and humidity region of south China, cotton usually suffers from water logging stress in growing stage. It is of great significance to reveal the effect of water logging stress on cotton growth and yield for appraisal of agricultural disaster caused by water logging and disaster reduction. The problem of cotton suffering from waterlogged stress was studied. Analysis showed that LAI in the cotton bud period stage and flowering and boll-setting stage is restrained by water logging stress, which is opposite to LAI in the cotton boll opening stage. The degree of water logging can be described by the water logging factors such as SFEW30. There is a significant linear relationship between the cotton relative yield Ry and the water logging factors such as SFEW30 in different growth period, and the cotton yield under water logging condition is the most sensitive in the flowering and boll-setting stage.
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