Grateful acknowledgement is made to Department of Land
Development, Ministry of Agriculture and Cooperatives, Thailand
for providing financial support to this research. Acknowledgement
is extended to Khon Kaen University and the Faculty of Agriculture
for providing financial support for manuscript preparation activities.
Thanks to Dr. John M. Schiller, Honorary Senior Fellow, Faculty
of Science, School of Agriculture and Food Sciences, University of
Queensland, Australia for his valuable comments to the manuscript