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Submitted on: 11 July 2002.
Revised on: 02 September 2002.
Accepted on: 03 October 2002.
___________________FIELD CROPS RESEARCH---ELSEVIER
Submitted on: 26 June 2007.
Revised on: 15 September 2007.
Accepted on: 03 November 2007.
___________________FIELD CROPS RESEARCH---ELSEVIER