Ratanaprommanee, C., Chinachanta, K. and Chaiwan, F. (2017) “Chemical characterization of leonardite and its potential use as a soil conditioner for plant growth enhancement”, Asia-Pacific Journal of Science and Technology, 22(4), pp. APST–22. Available at: https://so01.tci-thaijo.org/index.php/APST/article/view/107637 (Accessed: 4 May 2024).