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| Calculating Discharge Coefficients for Soil Nutrients in Wheat-Maize Rotation System Under Different Fertilization Practices |
| Received:December 12, 2014 |
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| KeyWord:wheat-maize rotation;organic fertilizer;nutrient leaching;discharge coefficient |
| Author Name | Affiliation | E-mail | | YUAN Jing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Guo-xue | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn | | LI Rong-hua | Monitoring Station of Agricultural Environment and production, Beijing 102401, China | | | LI Ning | Xiaogan Environment protect bureau, Xiaogan 432100, China | | | YANG Fan | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| In order to find out nutrient leaching from different fertilization practices, a two-year nutrient leaching experiment was designed in a wheat-maize rotation farmland in Fangshan district, Beijing. Nutrient leaching was measured in optimized fertilization, traditional fertilization and no fertilization(control) fields using vacuum negative pressure. Results showed that TN leaching was accounted for 76%~82% of total nutrient leaching for all treatments. Nitrate nitrogen was the main component of TN losses, accounting for 60%~70% of TN leaching, with the highest of 90%. At the equal amounts of NPK, the optimized fertilization reduced TN leaching by 23%~31%, TP leaching by 32%~46%, and NOx--N leaching by 22%~36%, compared with traditional fertilization. The reduction of NH4+-N leaching by the optimized fertilization was more significant under greater rainfall. In wheat-maize rotation system, the discharge coefficient of production per kilogram agricultural products for TN,TP, NH4+-N and NOx--N was 687.2 mg, 3.25 mg, 0.22 mg and 440 mg for traditional fertilization and 348 mg, 0.87 mg, 0.38 mg and 205.9 mg for optimized fertilization, respectively. These results would provide technical support for pre-warning monitoring and pollution control of wheat-maize rotation system. |
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