Abstract: The effect of soil water stress on law of water consumption and yield in winter wheat had been studied in pot culture and pondlet cultrue with rain proof shelter.The results showed: Following the increase of waterstress,dry matter accumulation would be reduced and the ratio coming form stored assimilation increased,yield reduced.The kernel numbers and spike numbers of the three yield components lessen to a big margin,however,the weight of 1000 kernels lessens to a small margin.Following the increase of water stress,the ratio of water consumption before jointing stage in total water consumption increased,higher the ratio of water consumption and total water consumption from sowing to jointing, earlier the plants declining and lower the yield after jointing.In middle drought,though it accelerated to the increase of water production efficiency and economic index,the comprehensive economy efficiency was less than that in light drought and control,and the comprehensive economy efficiency of light drought was the highest in four treatments.60% relative water capacity could be the minimum indice of water for normal growth, development and high yield of winter wheat ,and the theory basis for taking measure of irrigating and culture.

Key words: Winter wheat, Soil water stress, Law of water consumption, Yield

CLC Number: 

• S512.07