Abstract: The effect of irrigation on the yield of wheat and water utilization under limited irrigation was studied in the hilly dry farming in the west of Henan province.The results showed the average yield could be increased 13.0%-39.6% by the irrigation and the efficiency of water utilization can be improved 7.0%-18.0% when the volume of irrigation ranged from 0mm to 90mm.On the other hand,the physiological properties and yield gene of winter wheat could be also improved.In a year with enough precipitation,the volume of supplementary irrigation that satisfied to the maximum efficiency of the crop water utilization was 45mm,and that of the highest ratio of irrigated water utilization ranged from 30mm to 45mm.However,the number of ears of winter wheat could be augmented by irrigation during the jointing and earrings stage and the ratio of irrigated water utilization could be improve too.While irrigating during the seed filling stage,the weight of 1000 grains and the efficiency of water utilization could be improved.In a word,the best time of irrigation is the jointing and earrings stage.

Key words: Winter wheat, Limited irrigation, Yield, Efficiency of water utilization, Dryland

CLC Number: 

• S512.01