| Based on the broad ridge planting measure,the effects of plastic film,emulsion asphalt,aquasorb,polyacrylamide(PAM) and intercropping on water use efficiency of maize were studied in the loess hilly region in Yan'an.The results showed that the treatments of plastic film,aquasorb,PAM and intercropping could improve soil water effectively,and the water content of these treatment was 17.4%,8.5%,11.6% and 5.3% more than level planting respectively.Moreover,the treatments of emulsion asphalt,plastic film,intercropping and PAM could increase the yield of maize by 77.7%,72.0%,64.1% and 30.8%,respectively. |