Jing He, and Yanan Li. “Effects of Humic Acid on Chlorophyll Content and Root Length of Ryegrass (lolium Multiflorum lam.) ”. Bangladesh Journal of Botany 52, no. 20 (August 31, 2023): 467–472. Accessed February 7, 2025. https://banglajol.info/index.php/BJB/article/view/68196.