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Submitted on: 01 July 2001.
Revised on: 04 October 2001.
Accepted on: 02 November 2001.
___________________Agricultural & Environmental Letters
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Submitted on: 16 July 2023.
Revised on: 21 October 2023.
Accepted on: 19 November 2023.
___________________Agricultural & Environmental Letters
Submitted on: 15 November 1998.
Revised on: 26 February 1999.
Accepted on: 12 March 1999.
___________________Agricultural & Environmental Letters
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