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| Influence of combined synthetic fertilizer and biochar applications on nitrogen and phosphorus losses from surface water of paddy field |
| Received:August 14, 2015 |
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| KeyWord:non-point pollution;biochar;paddy field surface water;nitrogen and phosphorus loss;ecological benefits |
| Author Name | Affiliation | E-mail | | FENG Ke | Key Laboratory of Songliao Aquatic Environment, Ministry of Education, School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, CAS, Changchun 130012, China | | | TIAN Xiao-yan | Key Laboratory of Songliao Aquatic Environment, Ministry of Education, School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China | | | WANG Li-xia | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, CAS, Changchun 130012, China | lxwang@iga.ac.cn | | OU Yang | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, CAS, Changchun 130012, China | | | YAN Bai-xing | Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, CAS, Changchun 130012, China | | | FU Yu | Fuxin Environmental Protection Bureau, Fuxin 123000, China | |
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| Abstract: |
| Fertilization management is an effective measure for controlling non-point source pollution from paddy field. In this paper, nitrogen and phosphorus losses from the surface water of paddy field were investigated during rice growth season under the same inputs of exogenous nitrogen but partial replacement of synthetic fertilizer by different rates of biochar(5 t·hm-2,10 t·hm-2 and 20 t·hm-2). Results showed that TN, NO3--N, and NH4+-N concentrations in the surface water of paddy field reached a peak on the third day of fertilization, but decreased rapidly thereafter. TP concentrations showed slow increases 2~4 days after fertilization, but rapidly declined to a stable state after that. Applying biochar had little influence on total phosphorus(TP) in paddy field. Water-soluble phosphorus had the same trend as TP concentration. The critical period to reduce nitrogen and phosphorus loads should be within 10 days after fertilization. Application of biochar mitigated the fluxes of nitrogen and phosphorus outputs from paddy field water by 39%~50% and 38%~50%, respectively. Combined applications of synthetic fertilizer and biochar increased rice production slightly. Based on the recommended application rate of biochar(5 t·hm-2), the annual nitrogen and phosphorus outputs would be 16.83 kg·hm-2 and 1.89 kg·hm-2, respectively. |
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