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Submitted on: 05 May 2002.
Revised on: 05 July 2002.
Accepted on: 24 July 2002.
___________________JOURNAL OF THE FACULTY OF AGRICULTURE KYUSHU UNIVERSITY
Submitted on: 22 December 2000.
Revised on: 26 March 2001.
Accepted on: 17 May 2001.
___________________JOURNAL OF THE FACULTY OF AGRICULTURE KYUSHU UNIVERSITY
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