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Sawdust biochar application to rice paddy field: reduced nitrogen loss in floodwater accompanied with increased NH3 volatilization

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Abstract

Sawdust biochar (SDB) was for the first time applied to rice paddy field to evaluate its effects on potential nitrogen (N) runoff and ammonia (NH3) volatilization losses in a soil column experimental system. Results showed that total N concentration of surface floodwater under SDB treatments was reduced by 7.29–35.16, 16.34–32.35, and 12.21–28.12% after three split N fertilizations, respectively. Particularly, NH4+–N was decreased by 11.84–27.08, 14.29–36.50, and 2.97–19.64%, respectively. However, SDB addition has no significant influence on NO3–N concentration. Meanwhile, SDB application increased NH4+–N and total N content of top (0–15 cm) soil. Furthermore, these SDB-induced influences were more pronounced for 3 wt% SDB treatments. SDB treatments recorded 3.56–5.78 kg ha−1 higher NH3 volatilization than urea control treatment, which was attributed to the elevated pH values of floodwater and top soil induced by SDB. Fortunately, the yield-scale NH3 volatilization was not increased dramatically.

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Acknowledgements

The authors are grateful for the financial support of the Natural Science Foundation of China (41401345, 31601832), Natural Science Foundation of Jiangsu Province (BK20160931, BK20140755), High-Level Talent Start-Up Research Project of Foshan University (GG07030), National Key Research and Development Program of China (2017YFD0800100), and USDA NIFA McIntire-Stennis Program (MAS 00028). Yanfang Feng gratefully thanks the support from Scholarship of JAAS to study at the University of Massachusetts, Amherst. The contributions of Ms. Qian Gao and Dr. Di Wu on pre-experiments are highly appreciated.

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Correspondence to Linzhang Yang or Weiming Shi.

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Responsible editor: Hailong Wang

Yanfang Feng and Haijun Sun are co-first authors

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Feng, Y., Sun, H., Xue, L. et al. Sawdust biochar application to rice paddy field: reduced nitrogen loss in floodwater accompanied with increased NH3 volatilization. Environ Sci Pollut Res 25, 8388–8395 (2018). https://doi.org/10.1007/s11356-017-1059-y

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  • DOI: https://doi.org/10.1007/s11356-017-1059-y

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