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 August 16, 2024. https://banglajol.info/index.php/BJB/article/view/68196.