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Submitted on: 03 November 2001.
Revised on: 21 November 2001.
Accepted on: 28 November 2001.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
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Submitted on: 03 September 2010.
Revised on: 07 October 2010.
Accepted on: 31 October 2010.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
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http://reply.papertrans.cn/3/284/28309/28309-29.png
Submitted on: 27 November 2006.
Revised on: 10 January 2007.
Accepted on: 03 February 2007.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL