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Chemical characterization of leonardite and its potential use as soil conditionerand plant growth enhancement |
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| รหัสดีโอไอ | |
| Creator | Arawan Shutsrirung |
| Title | Chemical characterization of leonardite and its potential use as soil conditionerand plant growth enhancement |
| Contributor | Chanyut Ratanaprommanee, Kawiporn Chinachanta, Fapailin Chaiwan |
| Publisher | Research and Technology Transfer Affairs Division.Khon Kaen University. |
| Publication Year | 2560 |
| Journal Title | Asia-Pacific Journal of Science and Technology (APST) |
| Journal Vol. | 22 |
| Journal No. | 4 |
| Page no. | 1-10 |
| Keyword | Leonardite, Plant nutrients, Soil amendment, SEM |
| URL Website | https://tci-thaijo.org/index.php/APST/index |
| Website title | https://tci-thaijo.org/index.php/APST/article/view/107637 |
| ISSN | 2539-6293 |
| Abstract | Humic substanceswhich are major component of natural organic matter(NOM)play a major role through their impacts on soil fertility (physical, chemical, and biological soil properties)and plant development. Concerns about soil and environmental degradation caused by intensive high-input agriculturestimulated substantial efforts to increase organic matter particularly humic substances in the soils.Leonardite is NOM which contains high amount of humic substancesparticularly humic acid. Leonardite from various deposits in Thailand wasexamined as a potential NOM for soil improvement. Chemical compositionsof leonardite varied from deposit to deposit. Leonardite from Lee mine contained the highest amount of humic acid (39.19 to 85.05%). Plant nutrients elements contained in all the leonarditesampleswere quite high (N, K, S, Ca, Mg, Fe, Zn and Mn) except for phosphorus. Characterization of leonardite samples by X-ray diffraction(XRD)and X-ray fluorescence spectrometry (XRF) showed that silica (Si) was the major element. High plant nutrients and humic acid content in leonardite samples indicatedits high possible use to improve organic matter, humic acid and some plant nutrient levels inthesoils. However,the very low pH values (1.84 to 2.55) and low Pcontent (28.6to 211.2mg kg-1) of most leonarditesamplesshould be raised before use. The information obtained from our study would be useful for appropriate use of leonardite in agriculture. In addition, with layer structure, high humic acid and nutrients contents of leonardite, it could be also used as microbial carrier as well as peat. Further investigation should be performed to obtain maximum benefit from this natural organic material. |
