Poungprakho K. Competition in Maize by Annual Weeds ІІ Effects of Nitrogen Fertilizer and Weeds on Yield components . Thai Agric.Res.J. [internet]. 1990 May 1 [cited 2026 Oct. 1];8(2):34-8. available from: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/242414