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| Structural characteristics of straw-derived artificial humic acid and their effects on maize seed germination |
| Received:September 29, 2024 |
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| KeyWord:hydrothermal reaction;rice straw;artificial humic acid;structure;seed germination |
| Author Name | Affiliation | E-mail | | LIU Zeng | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHU Piao | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | PAN Wentao | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | SHI Lei | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LUO Yanna | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | JING Jianyuan | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | jyjing@ahau.edu.cn | | CHEN Xiaohui | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | XIONG Qizhong | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YE Xinxin | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Ministry of Natural Resources Key Laboratory of Jianghuai Arable Land Resources Protection and Ecological Restoration/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| In order to investigate whether straw-derived artificial humic acids possess biological activity that stimulates plant growth, and to analyze the underlying mechanism based on the structural features of humic acids. In this study, artificial humic acid（A-HA）was synthesized from rice straw through a hydrothermal reaction, while weathered coal humic acid was selected as a representative of M-HA, which was used as a control. Elemental compositions, functional group types, and molecular weights of the two humic acids were analyzed. The effects of different concentrations of M-HA and A-HA solutions on seed germination and seedling growth of maize were studied, along with its potential mechanism. The results indicated that, in comparison with M-HA, A-HA exhibited a lower degree of humification and fewer acidic functional group, with a significant reduction in total acidity, carboxyl, and phenolic hydroxyl contents by 50.8%, 41.7%, and 76.5%（P<0.05）, respectively. However, A-HA contained a higher proportion of small molecule fractions compared to M-HA. Similar to M-HA, A-HA exhibited amphiphilic properties. However, the hydrophobic C in A-HA was primarily derived from alkyl-C（0-45 ppm） and aromatic-C（110-160 ppm）, whereas M-HA′s hydrophobic C was primarily derived from aromatic-C. Soaking maize seeds in solutions containing 1 mg·L-1（calculated as C, the same below）of M-HA and 10 mg·L-1 of A-HA resulted in a germination rate（GR）of 100%, and compared to the control treatment without humic acids, the germination index（GI）, germination potential（GP）, number of lateral roots（NLR）, and length of lateral roots（LRL）were significantly improved by 51.7% and 29.5%, 42.2% and 34.3%, 48.1% and 33.3%, and 58.2% and 39.0%, respectively（P<0.05）. In summary, although A-HA differs from M-HA in terms of structure and composition, it similarly stimulates seed germination and seedling growth, demonstrating its potential to be developed as a plant growth stimulant. |
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