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| Effects of different swine manures on soil pH, humic acid content, and Cu and Zn activities |
| Received:November 15, 2015 |
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| KeyWord:swine manure;vegetable soil;humic acid;heavy metal;activity |
| Author Name | Affiliation | E-mail | | YU Tian-hong | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agro-environment, Ministry of Agriculture of China, South China Agricultural University, Guangzhou 510642, China | | | LI Hua-shou | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agro-environment, Ministry of Agriculture of China, South China Agricultural University, Guangzhou 510642, China | lihuashou@scau.edu.cn | | HE Hong-zhi | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agro-environment, Ministry of Agriculture of China, South China Agricultural University, Guangzhou 510642, China | | | CHEN Gui-kui | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agro-environment, Ministry of Agriculture of China, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| In the present study, three different swine manures containing excessive Cu and Zn, including air-dry fresh swine manure(FM1), air-dry swine manure compost(FM2), and bio-bed swine manure(FM3), were selected to investigate their effects on soil pH, humic acid(HA) content, total Cu and Zn, and Cu and Zn activities in vegetable soil in laboratory incubation for 30 days. Soil pH, HA content and total Cu and Zn content increased significantly after additions of three different manures, compared to the control. However, HA and water soluble Cu and Zn content decreased, but HA-Cu, HA-Zn content increased over time, with the most significant increases in HA-Cu and HA-Zn found in FM2-amendment. Compared to day 1, FM1, FM2, and FM3 treatments respectively increased percentages of HA-Cu by 12.67%, 21.23%, and 7.73% on day 30, enhanced HA-Zn percentages by 9.68%, 21.90%, and 9.74% on day 10. However, HA-Zn in three treatments were lower on day 30 than on the day 1. These results indicate that FM2 is most effective in reducing Cu and Zn activities. |
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