1. Department of Land Use Engineering, College of Land Science and Technology, China Agricultural University, Beijing, China
2. Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand
3. Land Development Department, Ministry of Agriculture and Cooperatives, Bangkok, Thailand
4. Department of Plant Science, Faculty of Agricultural Technology, Rajamangala University of Technology Lanna, Nan, Thailand
5. Scientific and Technological Research Equipment Center, Chulalongkorn University, Bangkok, Thailand