Chantana Siripaibool และ Pornpimol Chaiwanakupt; Jittra Claimon; Jariya Prasatsrisupab; Thianchai Arayangkoon; Preecha Vadisirisak; Woravich Rungrattanakasin. (1999) Evaluation fo Dinitrogen Fixation and Yield of Soybean Cultivars under Conditions of Zero and Conventional Tillage by 15N Technique. <i>Thai Agricultural Research Journal</i>, <i>17</i>(2), 116-128.Chantana Siripaibool และ Pornpimol Chaiwanakupt; Jittra Claimon; Jariya Prasatsrisupab; Thianchai Arayangkoon; Preecha Vadisirisak; Woravich Rungrattanakasin. "Evaluation fo Dinitrogen Fixation and Yield of Soybean Cultivars under Conditions of Zero and Conventional Tillage by 15N Technique". Thai Agricultural Research Journal 17 (1999):116-128.Chantana Siripaibool และ Pornpimol Chaiwanakupt; Jittra Claimon; Jariya Prasatsrisupab; Thianchai Arayangkoon; Preecha Vadisirisak; Woravich Rungrattanakasin. Evaluation fo Dinitrogen Fixation and Yield of Soybean Cultivars under Conditions of Zero and Conventional Tillage by 15N Technique. Department of Agriculture:ม.ป.ท. 1999.