Effects of water deficit on cotton growth,physiology and yield

Results of pot experiments showed that water deficit affected the height,buds,bulls falling and quantity of productive bulls of cotton.Severe water deficit at seedling stage and wadding stage,medium water deficit at buds and bolls stage can be propitious to cotton yield.The threshold value of soil water contents for photosynthesis and stomatal resistance is about 14%(θg),i.e.,60%～65% of field capacity.The lower limits of soil moisture for rational deficit irrigation scheduling to cotton at its different growth stages are 55%～60%,65%,70% and 50%～55% of field capacity at seedling,buds,bolls and wadding stages,respectively.