Sakorn Phongpan และ Pornpimol Chaiwanakupt; Jenvith Sookthongsa. (2001) Effect of Urease Inhibitors on Ammonia Loss and Efficiency of Broadcast Urea in Lowland Rice Field. <i>Thai Agricultural Research Journal</i>, <i>19</i>(2), 91-105.Sakorn Phongpan และ Pornpimol Chaiwanakupt; Jenvith Sookthongsa. "Effect of Urease Inhibitors on Ammonia Loss and Efficiency of Broadcast Urea in Lowland Rice Field". Thai Agricultural Research Journal 19 (2001):91-105.Sakorn Phongpan และ Pornpimol Chaiwanakupt; Jenvith Sookthongsa. Effect of Urease Inhibitors on Ammonia Loss and Efficiency of Broadcast Urea in Lowland Rice Field. Department of Agriculture:ม.ป.ท. 2001.