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| Ammonia volatilization and its influencing factors in tea garden soils |
| Received:September 16, 2015 |
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| KeyWord:acid tea garden soil;N application rate;N-application time;nitrogen volatilization;association analysis |
| Author Name | Affiliation | E-mail | | WANG Feng | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fuan 355015, Fujian, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | CHEN Yu-zhen | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fuan 355015, Fujian, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | WU Zhi-dan | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fuan 355015, Fujian, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | JIANG Fu-ying | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fuan 355015, Fujian, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | WENG Bo-qi | Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | YOU Zhi-ming | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fuan 355015, Fujian, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | 847842412@qq.com |
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| Abstract: |
| Ammonia(NH3) volatilization is a main pathway of nitrogen loss in tea garden soils. In situ experiments using cement tanks combined with venting approach were conducted to study the effects of rates and time of nitrogen applications on ammoina volatilization in acid tea gardens. The experiment included three nitrogen treatments, i.e. CK(control, no N application), N1(reducing N fertilization, 225 kg·hm-2) and N2(traditional nitrogen rate, 450 kg·hm-2). The nitrogen was applied at three times as top dressing in spring, top dressing in autumn and basal dressing in winter at a proportion of 3:3:4. Soil NH4+-N and NO3--N content was analyzed and also correlated with climatic factors. Results showed that total NH3-N volatilization losses varied from 13.01 to 60.85 kg·hm-2. The percentages of lost NH3-N to the total amount of N applied ranged from 10.63% to 12.42%. Compared with the CK, NH3-N volatilization losses were 214.78% and 367.72% higher in N1 and N2 treatments, respectively. The NH3-N volatilization also varied significantly among application stages, with more NH3-N volatilization losses in winter basal dressing than in spring or autumn top dressing. About 50% of total N was lost via volatilization in winter basal dressing, possibly attributable to high NH +4-N content over a longer time period in soils. Partial correlation analysis showed that nitrogen volatilization was significantly positively correlated with NH4+-N content in soils, soil temperature, and air relative humidity, but negatively with soil moisture and air temperature. No correlation was found between nitrogen volatilization and soil NO3--N content. |
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