Effects of dual-mulching with plastic film and other mulching materials on soil water and WUE in semiarid region

The winter wheat dual-mulching experiments were carried out with plastic film mulching on ridges and other different mulching materials in furrows in Weibei dryland from September 2007 to June 2009.The results showed that: The treatment of plastic film and straw dual-mulching can increase wheat yield significantly,the highest rate of increase is 39.62%(P0.05) compared with the CK(no covering on ridges or in furrows),and the two-year average yield of wheat in the treatment of dual-mulching with plastic film and black liquid film increased by 32.16%,and the treatment of only plastic film mulching on ridges increased by 29.99%.The treatment of dual-mulching with plastic film and straw has obvious effect of preserving soil moisture within 0～40 cm soil depth,which can effectively improve soil moisture content.The soil moisture content of 0～40 cm soil depth increased by 15.81% in heading stage.The treatment of dual-mulching with plastic film and black liquid film has a good water-retention effect in the early growth period of wheat,which increased the water content by 11.01% within 0～40 cm soil depth at jointing stage of winter wheat.The water use efficiency in the treatments of dual-mulching with plastic film and straw,and dual-mulching with plastic film and black liquid film were increased by 31.11%(P0.05) and 26.20%(P0.05) respectively compared with the CK.