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Submitted on: 03 April 1999.
Revised on: 26 April 1999.
Accepted on: 10 May 1999.
___________________Agronomy for Sustainable Development
Submitted on: 02 June 2018.
Revised on: 05 September 2018.
Accepted on: 16 October 2018.
___________________Agronomy for Sustainable Development
Submitted on: 13 June 2011.
Revised on: 26 August 2011.
Accepted on: 10 September 2011.
___________________Agronomy for Sustainable Development
Submitted on: 16 April 1998.
Revised on: 24 May 1998.
Accepted on: 16 June 1998.
___________________Agronomy for Sustainable Development
Submitted on: 16 October 2013.
Revised on: 10 December 2013.
Accepted on: 29 December 2013.
___________________Agronomy for Sustainable Development