Sawai Pongkao. Effect of Sowing Dates and Amount of Nitrogen Fertilizer at Sowing on Fixation Activity and Different Attributes of Lupinus albus L. cv. Kievskij Mutant. Agr. Nat. Resour. [internet]. 1987 Dec. 30 [cited 2026 Sep. 18];21(4):378-89. available from: https://li01.tci-thaijo.org/index.php/anres/article/view/242629