Sakorn Phongpan และ Pornpimol Chaiwanakupt; Chayong Nammuang; Jariya Prasatsrisupab; Prewpan Kulnateetip; Jenvith Sookthongsa. (1997) Use of Inhibitors to Improve the Efficiency of Urea Fertilizer in Lowland Rice Field. <i>Thai Agricultural Research Journal</i>, <i>15</i>(2), 145-161.Sakorn Phongpan และ Pornpimol Chaiwanakupt; Chayong Nammuang; Jariya Prasatsrisupab; Prewpan Kulnateetip; Jenvith Sookthongsa. "Use of Inhibitors to Improve the Efficiency of Urea Fertilizer in Lowland Rice Field". Thai Agricultural Research Journal 15 (1997):145-161.Sakorn Phongpan และ Pornpimol Chaiwanakupt; Chayong Nammuang; Jariya Prasatsrisupab; Prewpan Kulnateetip; Jenvith Sookthongsa. Use of Inhibitors to Improve the Efficiency of Urea Fertilizer in Lowland Rice Field. Department of Agriculture:ม.ป.ท. 1997.