Effects of mulching with different kinds of plastic film on growth and water use efficiency of winter wheat in Weibei Highland

A study was conducted on growth conditions,water use efficiency and yield-increasing effect of two kinds of different degradable mulching films and common plastic film in Weibei Highland of Shaanxi.The results showed that the plant height,dry matter accumulation,yield and water use efficiency of winter wheat treated with biodegradable film and common plastic film were significantly(P0.05) higher than that with conventional open field cultivation,and winter wheat ears were remarkably increased,so as a modest increase in the number of grains per spike.The yield-increasing extent was 6.45% and 28.95%,7.52% and 22.44% respectively without significant difference between these two kinds of coverage in two consecutive years,and the water use efficiency increased by 11.39% and 35.02%,14.40% and 12.96% respectively.The soil water storage of 0～200 cm soil layer increased by 17.9～64.2 mm compared with the control.The common plastic film had a great role in promoting plant height and dry matter accumulation in winter wheat,while the liquid film,because of its vulnerability to environmental impact,could not fully play its physiological and ecological effects.Biodegradable film had good soil moisture conservation effect and increased water use efficiency to 17.73 kg/(mm·hm2),as well as showed good economic and ecological benefits due to effectively solving the "white pollution" problem.