Ratanaprommanee C, Chinachanta K, Chaiwan F. Chemical characterization of leonardite and its potential use as a soil conditioner for plant growth enhancement. Asia Pac J Sci Technol [internet]. 2017 Dec. 29 [cited 2025 Apr. 7];22(4):APST-22. available from: https://so01.tci-thaijo.org/index.php/APST/article/view/107637