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《Journal of Northwest A & F University(Natural Science Edition)》 2011-01
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Effects of organic fertilization on the changes of soil nutrient and soil enzyme activities in arid areas

MA Xiao-li1a,2,JIA Zhi-kuan1a,XIAO En-shi1b,HAN Qing-fang1a,NIE Jun-feng1a,YANG Bao-ping1a,HOU Xian-qing1a,WEI Ting1a,GAO Fei1a(1 a Research Center of Agriculture in Arid and Semiarid Areas,b College of Agronomy,Northwest A&F University,Yangling,Shaanxi 712100,China;2 Technology Promotion Center of Agriculture in Hanzhong City,Hanzhong,Shaanxi 723000,China)  
【Objective】 The study was to explore the effect of different amounts and kinds of organic fertilization on soil nutrient and soil enzyme activities.【Method】 A two-year(2007-2009) field experiment was carried out in Weibei Loess plateau of Shaanxi province,compared with that treated with single fertilizer,in the 0-40 cm layer,soil nutrient and enzyme activities of different application rates of straw(9 000,6 000 kg/hm2)and manure(22 500,11 250 kg/hm2)were determined.【Result】 In 2008,compared with the control,content of organic matter increased significantly by 26.87%-33.49% in 20-40 cm layer through organic fertilizer treatments,and the content of available K increased significantly by 16.86%-35.85% and 11.34%-22.61% in 0-20 and 20-40 cm layers respectively.Content of available N and available P of the two years showed significant difference between these organic fertilizer treatments and control in 0-40 and 0-20 cm layers respectively.The activities of urease of organic fertilizer treatments showed no significant difference between organic fertilizer treatments and the control in 0-40 cm layer in the two years.Activities of alkaline phospatase showed significant difference in 0-20 cm layer in 2008,While in 2009 with the straw returning application of 9 000,6 000 kg/hm2 and the manure application of 22 500 kg/hm2,in the 0-20 cm layer,activities of invertase increased significantly by 0.19,0.18,0.13 mg/(g·h)respectively compared with that of the control.Through correlation analysis,active relationship existed between three kinds of enzyme activities and organic matter and available nutrient.【Conclusion】 Using organic fertilizers improved the amount of organic matter and available nutrient(N,P and K),and increased the activities of urease,invertase,alkaline phospatase.
【Fund】: 国家“十一五”科技支撑计划项目(2006BAD29B03);; 陕西省农业科技创新项目(2010NKC-03)
【CateGory Index】: S158.5
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