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| Effects of alkali-activated magnesium-loaded orange peel biochar on soil improvement after phosphorus absorption |
| Received:June 04, 2020 |
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| KeyWord:KMg-BC;soil improvement;phosphorus morphology;soil microorganism;soybean |
| Author Name | Affiliation | E-mail | | WANG Bo | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | LUO Ting | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | GOU Xi | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | TANG Yong | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | JIANG Fei | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | WU Tong | College of Environmental, Chengdu University of Technology, Chengdu 610059, China | | | XIE Yan-hua | College of Environmental, Chengdu University of Technology, Chengdu 610059, China
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China | xieyanhua10@cdut.edu.cn |
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| Abstract: |
| Modified biochar, which is a type of environment-friendly material, is often used in sewage adsorption to remove phosphate. However, if the biochar modified after phosphate adsorption is not treated properly, it can cause secondary pollution to the environment. In this study, to increase the number of resources for and to promote the harmless utilization of post-adsorption biochar, post-adsorption magnesium-carrying orange peel biochar(KMg-BC/P)was used to study improvements in soil conditions and to cultivate soybean. The results showed that the addition of KMg-BC/P in the appropriate quantity could significantly improve soil pH, organic matter content, cation exchange capacity, available phosphorus content, total phosphorus content, phosphorus release, and water holding capacity. Meanwhile, the contents of the high-efficiency phosphorus source and slow-acting phosphorus source increased, and the alkaline phosphatase activity in the soil also improved. KMg-BC/P also contributed to the conversion of inorganic phosphorus and low-activity organic phosphorus to high-activity organic phosphorus. In addition, KMg-BC/P promoted the growth and reproduction of soil bacteria and reduced the number and diversity of fungi. Cultivation in soil enriched with KMg-BC/P could promote soybean growth. This was indicated by the fact that the germination rate, plant height, root length, number of leaves, plant fresh weight, and stem thickness of soybean in the treatment group were better than the corresponding parameters in the control group. Therefore, KMg-BC/P may serve as a potential soil amendment. |
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