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Submitted on: 06 July 2004.
Revised on: 27 September 2004.
Accepted on: 05 November 2004.
___________________CALIFORNIA AGRICULTURE---UNIV CALIFORNIA, OAKLAND, DIVISION AGRICULTURE & NATURAL RESOURCES
Submitted on: 10 April 2005.
Revised on: 31 July 2005.
Accepted on: 01 September 2005.
___________________CALIFORNIA AGRICULTURE---UNIV CALIFORNIA, OAKLAND, DIVISION AGRICULTURE & NATURAL RESOURCES
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