Effect of urea fertilizer and environmental factors on CH4 emissions from a Louisiana, USA rice field
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Methane emissions from a flooded Louisiana, USA, rice field were measured over the first cropgrowing season. Microplots contained the semidwarf Lemont rice cultivar drill seeded into a Crowley silt loam soil (Typic Albaqualfs). Urea fertilizer was applied preflood at rates of 0, 100, 200 and 300 kg N ha−1. Emissions of CH4 from the plots to the atmosphere were measured over a 86-d sampling period until harvest. Methane samples were collected in the morning hours (07∶30–09∶30) using a closed-chamber technique. Emissions of CH4 were highly variable over the first cropping season and a significant urea fertilizer effect was observed. Two peak CH4 emission periods were observed and occurred about 11 d after panicle differentiation and during the ripening stages. Maximum CH4 emmissions from the 0, 100, 200 and 300 urea-N treatments were 6.0, 8.9, 9.8 and 11.2 kg CH4 ha−1 d−1, respectively. These flux measurements corresponded to approximately 210, 300, 310 and 360 kg CH4 evolved ha−1 over the 86-d sampling period for the 4 treatments.
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- Effect of urea fertilizer and environmental factors on CH4 emissions from a Louisiana, USA rice field
Plant and Soil
Volume 136, Issue 2 , pp 195-203
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- CH4 emissions
- Crowley silt loam
- field study
- flooded rice
- Industry Sectors
- Author Affiliations
- 1. Laboratory for Wetland Soils and Sediments and Nuclear Science Center, Louisiana State University, 70803-7511, Baton Rouge, LA, USA
- 2. Rice Research Station, Louisiana Experiment Station, 70527, Crowley, LA, USA
- 3. Chemical Engineering Department, Tulane University, 70118, New Orleans, LA, USA