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Submitted on: 20 September 2012.
Revised on: 28 October 2012.
Accepted on: 11 December 2012.
___________________GRASS AND FORAGE SCIENCE---WILEY
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Submitted on: 24 January 2014.
Revised on: 30 March 2014.
Accepted on: 01 May 2014.
___________________GRASS AND FORAGE SCIENCE---WILEY