In order to explore the resource of rain-fall under rain-fed regions of wheat-summer corn planting system

it is useful measures to combine bed-planting and strew mulching for improving water use efficiency(WUE).The experiment showed the summer corn cultivation of combinating bed-planting with strew mulching markedly increased the amount of soil water storage from 0~40 cm deep soil profile

especially in the scope of 5~10 cm

in contrast with the flatting cropping system.But the effects gradually decreased as soil profile extended deeply.The average value of free vaporizing on the top of corn population was 12.8%

7.6%

13.2% for the treatments of sole cropping with mulching

bed-planting

combinating bed-planting with mulching

respectively

in comparison with the treatment of sole cropping

but the average value of ground vaporizing 48.6%

29.9%

54.3%

respectively.The system of bed-planting and mulching improved WUE by 24.32%

and the rate of leaf losing water was the lowest among the four treatments.The results implicate that the pattern of bed-planting and mulching can effectively storage rain fall

and translate the soil water resource into plant water available at most.