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| Effects of mineral biochar on potato quality and soil fertility |
| Received:February 08, 2024 |
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| KeyWord:mineral biochar;potato;quality;soil fertility;soil enzyme activity |
| Author Name | Affiliation | E-mail | | ZONG Li | Key Laboratory of Clay Minerals of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China | | | LIN Hongxia | Gansu Lvjin Environmental Protection Functional Materials Technology Co., Ltd., Lanzhou 730080, China | | | MIAO Ningtao | Gansu Lvjin Environmental Protection Functional Materials Technology Co., Ltd., Lanzhou 730080, China | | | MU Bin | Key Laboratory of Clay Minerals of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China | mubin@licp.cas.cn |
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| Abstract: |
| This study aimed to evaluate the resource utilization potential of oil shale semi-coke into mineral biochar by pyrolysis carbonization for potato cultivation. The physicochemical properties and practical feasibility of mineral biochar were characterized and evaluated using Tianshu No. 10 as the experimental object. The effect of the added amount of mineral biochar on soil parameters, enzyme activity, and potato yields was studied. The component analysis indicated that mineral biochar contained essential elements of C, N, P, and K for the crop growth, and trace elements of Ca, Mg, Si, and Fe as well, while the content of heavy metals in mineral biochar was within the safe range of agricultural production. Moreover, the FIRT results suggested an increase in the degree of aromatization of surface functional groups after being carbonizated. The field trial results revealed that the soil pH and salinity presented rising trend with the increase in the added amount of mineral biochar, but the soil organic matter, available phosphorus, cation exchange capacity, soil sucrose, alkaline phosphatase and urease activities initially increased and decreased afterwards. Furthermore, the content of starch and dry matter in potato tubers also first increased and then decreased（P<0.05）, while the content of vitamin C and reducing sugar increased gradually and reached a significant level with the increasing amount of mineral biochar （P<0.05）. Compared with the control groups without addition of mineral biochar, the potato and commercial potato yields also increased first and then decreased with the increase in the added amount of mineral biochar, and the yield of them reached the highest after incorporation of 750 kg·hm-2（P<0.05）. In conclusion, this study findings indicated that mineral biochar application presented a positive effect on the soil quality, potato productivity and quality, and the optimal recommended dosage was 750 kg· hm-2. |
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