http://reply.papertrans.cn/1/35/3434/3434-31.png
http://reply.papertrans.cn/1/35/3434/3434-32.png
Submitted on: 15 May 2002.
Revised on: 12 July 2002.
Accepted on: 15 August 2002.
___________________Bioagro---UNIV CENTROCCIDENTIAL LISANDRO ALVARADO
Submitted on: 30 August 2008.
Revised on: 09 November 2008.
Accepted on: 14 December 2008.
___________________Bioagro---UNIV CENTROCCIDENTIAL LISANDRO ALVARADO
http://reply.papertrans.cn/1/35/3434/3434-35.png
http://reply.papertrans.cn/1/35/3434/3434-36.png