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| Effects of co-hydrothermal carbonization products derived from organic soil properties and biogas slurry on soil amendment and soybean growth regulation |
| Received:March 12, 2025 Revised:May 20, 2025 |
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| KeyWord:straw;sludge;biogas;hydrochar;hydrothermal liquid;soil nutrients |
| Author Name | Affiliation | E-mail | | HUANG Ping | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China | | | LI Huijuan | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China | | | LI Fayong | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China
Key Laboratory of Ministry of Education, Tarim Oasis Agriculture, Aral 843000, China | lisen8279@163.com | | HU Xuefei | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China
Key Laboratory of Ministry of Education, Tarim Oasis Agriculture, Aral 843000, China | | | QIAN Xiaoyan | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China
Key Laboratory of Ministry of Education, Tarim Oasis Agriculture, Aral 843000, China | | | SHI Meiling | College of Water Resources and Architectural Engineering, Tarim University, Aral 843300, China
Key Laboratory of Ministry of Education, Tarim Oasis Agriculture, Aral 843000, China | |
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| Abstract: |
| To address the technical need for co-disposal of agricultural solid wastes（e.g., corn/cotton stalks）and municipal sludge, this study innovatively employed biogas slurry as a reaction medium to investigate the hydrothermal carbonization（HTC）of agricultural stalkmunicipal sludge systems and the environmental effects of their derived products. Soil incubation experiments were conducted to systematically evaluate the soil amendment effects of cotton stalk hydrochar（MHC）, corn stalk hydrochar（YHC）, sludge hydrochar（SHC）, sludge-cotton composite hydrochar（SMHC）, and sludge-corn composite hydrochar（SYHC）. Additionally, a germination pouch hydroponic system was employed to explore the physiological and growth impacts of cotton stalk carbonization liquid（MAP）, corn stalk carbonization liquid（YAP）, sludge carbonization liquid（SAP）, sludge-cotton carbonization liquid（SMAP）, and sludge-corn carbonization liquid （SYAP）on soybean seedlings. Key results demonstrated that hydrochars significantly improved soil structure：soil moisture content increased by 16.2% - 77.5% compared to the blank control without hydrothermal charcoal（CK）, pH decreased by 0.40-0.98, and salt content declined by 55.7% - 59.7%. Hydrochars also enhanced soil nutrient levels, with SHC increasing total nitrogen（TN）and total phosphorus（TP）by 96.8% and 56.5%, respectively, and YHC elevating total potassium（TK）by 45.7%. Alkaline hydrolyzable nitrogen （AN）, available phosphorus（AP）, and available potassium（AK）rose by 15.4%-61.1%, 26.6%-127.5%, and 8.6%-39.2%, respectively, across treatments. Redundancy analysis（RDA）identified AN and AP as primary factors influencing plant growth. The carbonization liquid dose-dependently enhanced soybean seedling growth, increasing plant height, leaf area, stem diameter, and primary root length by 1.3%- 65.3%, 11.8%-41.4%, 0.9%-20.3%, and 5.5%-27.4%, respectively. Notably, YAP and SYAP significantly thickened stems, whereas SAP inhibited root elongation. Hydrochars promotes soybean seedling growth by improving soil properties, enhancing nutrient supply and water retention capacity, whereas carbonization liquid, despite facilitating root development, may inhibit seedling growth due to its high nitrate nitrogen and phenolic compounds. |
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