Pedosphere 24(5): 662--673, 2014
ISSN 1002-0160/CN 32-1315/P
©2014 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of urea and controlled release urea fertilizers on methane emission from paddy fields: A multi-year field study |
JI Yang1,2, LIU Gang1, MA Jing1, ZHANG Guang-Bin1 and XU Hua1 |
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2Department of Applied Meteorology, University of Information Science and Technology, Nanjing 210044 (China) |
| ABSTRACT |
| A four-year (2008–2011) field study was implemented in a major rice-growing region of China to better understand the effect of urea and controlled release fertilier (CRF, thermoplastic resin-coated urea in this study) on CH4 emission from paddy fields. Over the four years, the average CH4 emission during the rice growing seasons was 76.9, 65.8 and 64.9 kg CH4 ha-1 in treatments CK (zero N), U (urea) and C (CRF), respectively. Urea and CRF significantly reduced CH4 emission by 14.4% and 15.6%, and increased average rice grain yield by 25.8% and 19.7% (P < 0.05), respectively, compared with treatment CK. Flooding duration would affect CRF's effect on CH4 emission from paddy fields. Under normal aeration conditions, CH4 emission tended to be 3.9%–15.2% lower in treatment C than in treatment U from 2009 to 2011, while it tended to be 4.2% higher under delayed aeration conditions in 2008. The findings suggest that mid-season aeration (MSA) starting on D30 (30 days after rice transplanting), just like the local practice, would optimize the CRF's effect on CH4 emission from rice fields in China. Over the four years, average rice yield did not differ between treatments U and C, and tended to be 5% lower in treatment C than in treatment U. |
| Key Words: flood, trace gas, mid-season aeration, paddy soil, rice yield, thermoplastic resin-coated urea |
| Citation: Ji, Y., Liu, G., Ma, J., Zhang, G. B. and Xu, H. 2014. Effects of urea and controlled release urea fertilizers on methane emission from paddy fields: A multi-year field study. Pedosphere. 24(5): 662-673. |
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