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| Effects of field-aged biochar on NH3 emissions under wheat-maize rotation |
| Received:December 09, 2020 |
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| KeyWord:biochar;NH3 volatilization;fluvo-aquic soil;maize;wheat;rotation;air-flow enclosure method |
| Author Name | Affiliation | E-mail | | LIAO Xia | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU De-yan | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHEN Zeng-ming | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | HE Tie-hu | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | NIU Yu-hui | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | DING Wei-xin | State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | wxding@issas.ac.cn |
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| Abstract: |
| Using a continuous air-flow enclosure method, soil NH3 volatilization under wheat-maize rotation was monitored to explore the effect of different doses of field-aged biochar on NH3 volatilization. The field experiment included five treatments： no fertilization（Control）; conventional N application（CN）; conventional N fertilizer and 3 t·hm-2（NB3）, 6 t·hm-2（NB6）, and 12 t·hm-2（NB12）biochar. Biochar application after three years reduced wheat yield but had no apparent effect on maize yield. Additionally, biochar reduced the grain N uptake by wheat, while the NB3 and NB6 treatments increased the N uptake. In the fourth year after application, biochar reduced the cumulative NH3 emissions and NH3 emission factor of the applied N during the wheat season but increased these values during the maize season. The NB6 and NB12 treatments reduced the annual NH3 emissions. The NB6 treatment did not affect the yield-scaled NH3 emissions in the maize season but reduced the yield-scaled NH3 emissions in the wheat season, thereby reducing annual yield-scaled NH3 emissions. |
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