Joneer, Armeylee, and Lum Mok Sam. “Effect of Humic Acid on Growth and Yield of Tadong Upland Rice”. Science, Engineering and Health Studies 16 (December 29, 2022): 22030011. Accessed May 5, 2024. https://li01.tci-thaijo.org/index.php/sehs/article/view/257368.