Acknowledgments
This research was supported by The Royal Golden-Jubilee Ph.D.
Programme (Grant No. PHD/0059/2548, 2.NI.KT/48/Q.1), The
Thailand Research Fund and The Joint Graduate School of Energy
and Environment, King Mongkut’s University of Technology
Thonburi. We thank G. Gale and S. Tripetchkul for their comments
and suggestions, Mr. N. Saengong for access to research sites and
Mr. C. Yuttitham’s farmers and mill staff for help with the field
experiments.