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| Effects of Biochar on Ammonia Volatilization During Elodea Nuttallii Composting |
| Received:April 16, 2014 |
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| KeyWord:biochar;Elodea nuttallii;compost;ammonia volatilization |
| Author Name | Affiliation | E-mail | | WANG Hai-hou | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | | | SHEN Ming-xing | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | smxwwj@163.com | | TU Rong-wen | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | | | YAN Hui-xia | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | | | LU Chang-ying | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | | | SHI Lin-lin | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | | | ZHOU Xin-wei | Taihu Research Institute of Agricultural Sciences, Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China | |
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| Abstract: |
| Aquatic plants used in control of water eutrophification are rich in nitrogen(N), phosphorus(P), potassium(K), and micronutrients, and can be used as good organic fertilizer after composting. However, composting process often causes losses of N through ammonia(NH3) volatilization. Biochar has been shown to act as an absorber of NH3 and water-soluble NH4+ and might therefore reduce losses of N during composting of aquatic plants. Here a composting experiment with aquatic plants and rice straw was carried out under static pile composting with natural ventilation to study the effect of biochar at varying rates on NH3 volatilization reduction and influencing factors. Biochar addition significantly affected accumulated NH3 volatilization(P<0.01). Compared to the CK(no biochar addition), NH3 volatilization was increased by biochar at 5% and 10%, but decreased by biochar at 15% and 20%. During the first three days of composting, amount of NH3 volatilization was higher in biochar addition than in the CK, while during 4~6 days of composting, NH3 volatilization was lower in biochar than in the CK. A significant partial correlation existed between NH3 volatilization rates and compost temperature & ammonium nitrogen(P<0.05). These results show that biochar has two way effects on NH3 volatilization during composting aquatic plants by either decreasing NH3 volatilization through enhancing NH4+ adsorption, or increasing NH3 volatilization via raising the reactor temperature during composting. |
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