Jamsai C, Homchan J. Effect of Sewage Sludge from Ubonratana Hospital on Maize (Zea mays L.). Thai Agric.Res.J. [internet]. 2005 Nov. 27 [cited 2026 Sep. 30];23(3):252-6. available from: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/211997