About MOTOMURA S
About Tropical Agriculture Research Center, Tsukuba
About SEIRAYOSAKOL A
About Dep. Agriculture, Ministry of Agriculture and Cooperatives, Thailand
About CHOLITKUL W
About Dep. Agriculture, Ministry of Agriculture and Cooperatives, Thailand
About Technical Bulletin of the Tropical Agriculture Research Center
About paddy soil
About Thailand
About Rice cropping
About Soil fertility
About タイ
About 水田土壌