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《Research of Soil and Water Conservation》 2012-05
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Characteristics of Water Utilization Process and Efficiency under Different Fertilization Treatments in a Wheat Field

ZHANG Yan-qing1,LIU Wen-zhao2(1.College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China)  
Characteristics of water utilization process and efficiency under different fertilization treatments were studied through a field experiment conducted from 2010 to 2011.Results showed that under the condition of 90 kg/hm2 P application,the ratio of cropland water consumption to total supplied water(ET/SW) and the ratio of total transpiration to cropland water consumption(T/ET) gradually increased with the increased rate of N application if the rate of N application was between 0 and 135 kg/hm2,but crop water use efficiency with transpiration considered only(the ratio of grain yield to total transpiration,Y/T) and precipitation use efficiency(PUE) reached the highest value when the rate of N application was 180 kg/hm2.Under the rate of 90 kg/hm2 N application,the ET/SW was almost the same as the T/ET if the rate of P application was between 90 and 180 kg/hm2,but significantly higher than single N application treatment.The Y/T was gradually increased with the increased P application under the same N application.However,PUE reached the highest value when P application was 90 kg/hm2.In contrast to no fertilizer application,the combined application of 90 kg/hm2 P and 180 kg/hm2 N in the winter field,from jointing stage to maturity of winter wheat,increased the amount of cropland water consumption by 23.5%,the amount of transpiration by 186.8%,the ET/SW by 10.5%,the T/ET by 200%,the water use efficiency(Y/ET) up to 11.13 kg/(hm2·mm),and PUE up to 18.73 kg/(hm2·mm).
【Fund】: 国家自然科学基金项目(41171033)
【CateGory Index】: S512.1
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