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| Effects of partial replacement of chemical fertilizer with sludge compost on maize growth in chromium-contaminated farmland |
| Received:March 05, 2023 |
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| KeyWord:maize;sludge compost;chromium;sewage sludge utilization;soil;nutrient;crop yield |
| Author Name | Affiliation | E-mail | | CAO Chi | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHOU Xiaotian | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | GAO Yuxin | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MA Zhongwen | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Yao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YING Chunyang | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | XIE Junhao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHOU Fuhong | Mingguang Agricultural Technology Extension Center, Mingguang 239400, China | | | JIANG Haoyong | Mingguang Agricultural Technology Extension Center, Mingguang 239400, China | | | MA Youhua | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yhma@ahau.edu.cn |
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| Abstract: |
| To explore the rational utilization of sludge compost on chromium-contaminated farmland, a field experiment was conducted to investigate the effects of sludge compost application on crop growth and soil chromium accumulation. The experiment included blank controls, conventional fertilization, single application of sludge compost, and different ratios of sludge compost replacement for chemical fertilizers. Organic fertilizers were also used as a control. The results were examined from the perspectives of maize biomass, chromium absorption, and soil chromium content and its effectiveness. Results revealed that different amounts of sludge compost could promote maize growth and significantly increase maize yield, in the range of 15.24%-36.65%, compared with the control. The treatment with 20% sludge compost replacement for chemical fertilizers exhibited the best yield increase, with a 7.16% increase compared to conventional fertilization. The heavy metal chromium content in maize grains under each replacement fertilizer treatment was lower than the limit values in the standard GB 2762-2022, and the treatment with 30% sludge compost replacement for chemical fertilizers exerted the best effect in reducing chromium content in maize grains. The amount of chromium leached from the maize aboveground was greater than the amount of chromium brought in by the sludge when the application rate of sludge compost was between 750 kg·hm-2 and 1 500 kg·hm-2. The application of sludge compost during the season had no significant effect on the total soil chromium content, and the effective soil chromium content under each replacement fertilizer treatment decreased by 5.59% to 12.68% compared to the control. The application of sludge compost did not cause salt damage to crops and could alleviate soil acidification, increase soil organic matter, and improve the contents of total nitrogen, available phosphorus, and potassium. In summary, the application of sludge compost as a replacement for chemical fertilizers on chromium-contaminated farmland not only improves maize yield but also significantly reduces grain chromium content. An application rate of 1 500 kg·hm-2 can ensure safe and high yield of maize without the risk of chromium accumulation in the soil, as well as effectively improving soil nutrient indicators. |
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