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《Agro-environmental Protection》 2002-05
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Soil Acidification as Influenced by some Agricultural Practices

XU Ren kou1, D.R. Coventry2(1. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008,China;2. Department of Agronomy and Farming Systems, Adelaide University, Australia)  
Soil acidification, as influenced by N-fertilizer, stubble management and crop rotations, was investigated using soil samples from a long-term rotation trial at Tarlee, South Australia. There was a decrease in soil pH with time with all rotation, stubble management and N-fertilizer treatments. The order of the effects of different rotations on soil pH was: wheat-lupinswheat-bean wheat-wheat wheat-fallow. Both the application of N-fertilizerat the rate of 80 kg·hm-2 and the retention of stubble accelerated the soilacidification. The mean acidification rates for the period from 1978 to 1992 varied from 0.5 to 2.22 kmol H+·hm-2(year for different treatments. Soil andplant processes associated with the carbon and nitrogen cycles are main causes of soil acidification at this area. Soil Acidification resulted in the increase in soil exchangeable Al and CaCl2 extractable Al. It is possible that Al toxicity may occur in some treatments for sensitive plants.
【Fund】: 国家自然科学基金资助项目(49831005)
【CateGory Index】: S153
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