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《Journal of Irrigation and Drainage》 2010-01
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Effects of Straw Mulching Quantity on Growth and Water Use Efficiency of Dry Farming Spring Maize in Semiarid Areas

LI Yu-peng1,2,JIA Zhi-kuan1,2,YANG Bao-ping1,2,WANG Xin1,2(1.The Agricultural Research Center in arid and Semiarid Areas,Northwest A & F University,Yangling 712100,China;2.The Key Open Laboratory of Crop Production and Ecology in Arid Areas,Ministry of Agriculture,Yangling 712100,China)  
Cultivation experiments of four different straw mulch quantities of 0 kg/hm2、4 500 kg/hm2、9 000 kg/hm2 and 13 500 kg/hm2 are conducted in the dry farmlands of Southern Ningxia for two successive years.Results show that with the increasing of straw cover amount,observed values of agronomic characters of plant height,stem diameter and leaf areas of spring maize are improved obviously 45 days later after sowing compared with control group.When straw mulch amount is 13 500 kg/hm2,the values are improved respectively by 32.8%,48.4% and 39.1% on average.When 9 000 kg/hm2,the output and water use efficiency of spring maize is increased by 16.2% and 27.3%.When straw mulch amount is greater than 9 000 kg/hm2,effect of water conservation and yield increase is no longer enhanced significantly.
【Fund】: “十一五”国家科技支撑课题(2006BAD29B03;2007BAD88B10)
【CateGory Index】: S513
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