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| Effects of nitrification/urease inhibitors on mitigating N2O emission and transformation of N from calcareous fluvo-aquic soil |
| Received:October 11, 2016 |
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| KeyWord:nitrification inhibitor;urease inhibitor;N2O emission;N transformation;calcareous fluvo-aquic soil |
| Author Name | Affiliation | E-mail | | YANG Liu-qing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JI Jia-min | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JU Xiao-tang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | juxt@cau.edu.cn |
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| Abstract: |
| N2O emission can be reduced by nitrification and urease inhibitors which are also connected to soil N transformation. An incubation experiment was conducted in calcareous fluvo-aquic soil in order to compare the effects of different nitrification/urease inhibitors on N2O emissions and N transformation, find out proper nitrification/urease inhibitor for this soil, provide scientific basis for applying proper inhibitors in agricultural production. Seven treatments were set:No fertilizer(CK), Urea(U), Urea plus Nitrapyrin belonged to the Sinochem Group(U+NP), Urea plus recommended dosage of Nitrapyrin belonged to the Dow Chemical Company(U+NPD), Urea plus double recommended dosage of Nitrapyrin belonged to the Dow Chemical Company(U+2NPD), Urea plus Dicyandiamide(U+DCD) and Urea plus nBPT(U+nBPT). The incubation last for 56 days. Gases were sampled on the first, second, third, fifth, seventh, tenth, fourteenth and nineteenth day of the incubationfor N2O and CO2 analysis, soils were sampled on the zero, first, third, seventh, fourteenth, twenty-first, twenty-eighth, forty-second and fifty-sixth day of the incubation for N transformation analysis. The main results showed that the experimental nitrification/urease inhibitors reduced N2O emissions in different degrees, from 87.4% to 99.6% for nitrification inhibitor treatments while 30% for U+nBPT treatment compared with CK.There was only 0.03% to 0.84% of the ammonium transformed into N2O for nitrification inhibitor treatments, while 4.69% for U+nBPT treatment.There was no significant difference on mitigating N2O emissions between U+DCD and U+NPD, double recommended dosage of Nitrapyrin did not increase the effect on reducing N2O emission correspondingly. In summary, the experimental nitrification inhibitors significantly reduced N2O emissions from the calcareous fluvo-aquic soil, and the nitrification inhibitor effects were better than urease inhibitor. The best one was U+NP treatment. |
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