#Organic functional groups
Siwatt Pongpiachan* School of Social and Environmental Development, National Institute of Development Administration (NIDA); Kanjana Thumanu; Chulalak Chantharakhon; Chunmanus Phoomalee; Chaisri Tharasawatpipat; Ronbanchob Apiratikul; Saran Poshyachinda
