Snitwongse P. Selection of Non-Fixing Control Plants for Use in 15 N Dilution Method of Quantifying Dinitrogen Fixation in Soybean . Thai Agric.Res.J. [internet]. 1986 May 1 [cited 2026 Sep. 30];4(2):99-105. available from: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245175