1. Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand
2. Department of Agriculture and Resources, Faculty of Natural Resources and Agro-Industry, Kasetsart University-Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon Province, Thailand
3. Division of Research Administration and Academic Services, Office University-Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon Province, Thailand