1. Soil Science Program, Faculty of Agricultural Production, Maejo University, Chiang Mai 50290, Thailand
2. Department of Geology, Faculty of Social Sciences, Chiang Mai University, Chiang Mai 50200, Thailand
3. Environmental Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
4. Office of Agricultural Research and Development Region 2, Phitsanulok 65130, Thailand
5. Phitsanulok Rice Research Center, Phitsanulok 65130, Thailand