| The light and heat resource, is rather abundant in the oasis area of South Xinjiang but lack of water resource severely restricts the development of agriculture. five-year experiment was carried out to study the effect of strew mulching on water-saving of "Xiangli" pear (Pyrus. sinkiangensis. Yu) grown on oasis soil. The results indicated that all the treatments of straw mulching with different covering thickness (20 cm; 15 cm; 10 cm; 5 cm) were beneficial for improving the yield and quality of pear. In the 5 years, the average increment of yield was 15.2%65.3%; the water-saving efficiency was 28.8%36.1%; the content of organic matter in the soil was increased by 25.6%70.5%, and that of available N, P and K was increased by 39.176.4 mg/kg, 4.518.0 mg/kg and 29.876.9 mg/kg respectively. In the meantime, the number of roots with the diameter of more than 10 mm in 030 cm topsoil was raised by 55%122.1%. Considering the economic value, the suitable covering thickness was 15 cm, with which the average yield, the water-saving efficiency and the net income were increased by 7514.3 kg/hm\2, 508.55 yuan/hm\2 and 12 117.15 yuan/hm\2 respectively, and the ratio was 4.39. |