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| Effects of combined biochemical inhibitors and fertilization models on ammonia volatilization in yellow clayey paddy field |
| Received:May 14, 2017 Revised:October 09, 2017 |
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| KeyWord:urease inhibitor;nitrification inhibitor;N-(n-butyl) thiophosphoric triamide (NBPT);N-(n-propyl) thiophosphoric triamide (NPPT);2-chloro-6-(trichloromethyl) pyridine (CP);yellow clayey field;ammonia volatilization |
| Author Name | Affiliation | E-mail | | ZHOU Xuan | Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education/College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment/College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China | | | WU Liang-huan | Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education/College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment/College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | finm@zju.edu.cn | | DAI Feng | Zhejiang Aofutuo Chemical Co., Ltd., Shangyu 312300, China | | | DONG Chun-hua | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China | |
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| Abstract: |
| Ammonia(NH3) volatilization is one of the main pathways of nitrogen(N) fertilizer loss in rice production. This study was conducted to investigate the interaction effects of biochemical inhibitor combinations and fertilization models(one-off and three-time fertilizations) on ammonia(NH3) volatilization during the rice growing season in yellow clayey field using two-factor randomized block design. The results showed that NH3 volatilization loss mainly occurred within one week after fertilization during the rice growing season, and peaked within 1-3 days. Both biochemical inhibitor combinations and fertilization models had significant effects on the loss of NH3 volatilization. The three-time urea fertilization treatment significantly reduced the net NH3 volatilization loss rate by 24.6% than that of one-off urea fertilization treatment during the rice growing season. The addition of nitrification inhibitor CP significantly increased the peak value of NH4+-N concentration in surface water and NH3 volatilization rate, and thus enhanced NH3 volatilization loss under different fertilization modes. Combined with(or without) CP, the addition of urease inhibitor NBPT/NPPT significantly inhibited urea hydrolysis, and reduced the peak value of NH3 volatilization rate, and thus mitigated NH3 volatilization loss. The addition of new urease inhibitor NPPT alone(or combined with CP) had a similar trend of dynamic change of NH3 volatilization to that of NBPT. Correlation analysis showed that NH3 volatilization rate from paddy fields had a significant positive correlation with NH4+-N concentration and pH in surface water rather than air temperature, soil temperature, and soil relative moisture. In conclusion, biochemical inhibitors combined with appropriate management can more effectively reduce NH3 volatilization loss during the rice growing season from yellow clayey fields. |
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