Submitted on: 02 June 2000.
Revised on: 15 June 2000.
Accepted on: 23 June 2000.
Paddy and Water Environment
http://reply.papertrans.cn/3/240/23932/23932-32.png
Submitted on: 16 July 2000.
Revised on: 08 August 2000.
Accepted on: 04 September 2000.
Paddy and Water Environment---SPRINGER HEIDELBERG
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http://reply.papertrans.cn/3/240/23932/23932-35.png
Submitted on: 02 July 2000.
Revised on: 13 August 2000.
Accepted on: 26 August 2000.
Paddy and Water Environment