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