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《Journal of Agro-Environment Science》 2011-01
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Effects of Straw Returning on Soil Water and Crop Productivity in the Rainfed Area of Southern Ningxia,China

LU Wen-tao1,2,JIA Zhi-kuan1,2,GAO Fei1,2,LI Yong-ping1,3,HOU Xian-qing1,2(1.The Chinese Institute of Water-saving Agriculture,Northwest A&F University,Yangling 712100,China;2.Key Laboratory of Crop Production and Ecology,Minister of Agriculture,Northwest A&F University,Yangling 712100,China;3.Guyuan Institute of Agricultural Sciences,Guyuan 756000,China)  
Research on effects of straw returning treatments on soil water and crop productivity was conducted in the semi-arid areas of Southern Ningxia for providing a theoretical basis of expanding soil water storage capacity and improving crop water use efficiency.The different straw returning treatments were 3 000,6 000,9 000 kg·hm-2 of millet straw and 4 500,9 000,13 500 kg·hm-2 of corn straw,the CK had no straw returning.The results of three years field experiment showed that in the third experiment year(2009),follow the amount of straw returning from high to low,compared with CK,soil water storages(depth 0~200 cm) increased 8.8%,9.9% and 6.8% respectively at the sowing stage of corn;Soil water storages(depth 0~200 cm) increased 14.8%,13.9% and 12.8% respectively at the maturity stage of corn;Grain yield of corn increased 30.7%,29.2% and 12.5%(P0.05) respectively;The water use efficiency increased 41.1%,35.9% and 21.3%(P0.01)respectively.In the semi-arid areas of Southern Ningxia,the use of straw returning technology could play an active role in the preservation of soil moisture,expand soil water storage capacity,and increase crop yield and crop water use efficiency significantly.
【Fund】: “十一五”国家科技支撑课题“农田集雨保水关键技术研究”(2006BAD29B03);“节水共性技术研究”(2007BAD88B10)
【CateGory Index】: S141.4
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