Soil Scientist and Consultant,67/155 Amornpannivate 9,Soil senanikom 1,Phaholyothin Road adprao,Bangkok 10230,Thailand E-mail:asajja@idn.co.th;
Doctoral student,Agro-Ecology Institute,Zhejiang University,Hangzhou,Zhejiang province,China;
Soil Scientist,Soil and Fertilizer Institute,Sichuan Academy of Agricultural Science,Chengdu,China;
Soil Scientist,Soil and Fertilizer Institute,Yunnan Academy of Agricultural Science,Kunming,Chiina;
