ศาสตร์เกษตรดินปุ๋ย : ขอบคุณแหล่งข้อมูล : หนังสือพิมพ์ The Nation

http://www.nationmultimedia.com/video/play/8690

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A total of five countries from the Northern Asean region participated at a trade fair in Chiangrai. The event is aimed at boosting the region’s economy and bilateral relations.