Russell S. Yost¹, Tasnee Attanandana², Prateep Verapattananirund³, Sahaschai Kongton⁴ and Roongroj Pitukdantham², (1)Tropical Plant and Soil Science, University of Hawaii at Manoa, Honolulu, HI, (2)Department of Soil Science, Kasetsart University, Bangkok, Thailand, (3)Pan-Group, Bangkok, Thailand, (4)Department of Land Development, Bangkok, Thailand, Bangkok, Thailand