109-4 Nitrous Oxide Emissions From Drip Irrigated Tomatoes Subjected to Elevated Carbon Dioxide Levels.

Poster Number 999

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nutrient Losses
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Natalio Mendez1, Dave Goorahoo2, Florence Cassel Sharma2, Shawn Ashkan3 and Gerardo Orozco4, (1)Department of Plant Science, California State University-Fresno, Fresno, CA
(2)2415 E. San Ramon Ave. M/s AS72, California State University-Fresno, Fresno, CA
(3)Center for Irrigation Technology, California State University-Fresno, Fresno, CA
(4)2415 E San Ramon Ave M/S AS 72, California State University-Fresno Department of Plant Science, Fresno, CA
Increase in atmospheric greenhouse gas (GHG) concentrations, including those stemming from nitrous oxide (N2O) and carbon dioxide (CO2), has been partly attributed to agricultural and industrial activities.  N2O is emitted from soil to the atmosphere as part of the nitrogen (N) cycle, and the addition of N through fertilizers in intensive cropping systems increases N2O emissions.  CO2 enters the atmosphere as the result of fossil fuel, solid waste, wood burning and other industrial production processes.  However, CO2 can also be sequestered by plants as part of the biological carbon cycle.  Thus, sustainable agricultural practices are necessary to minimize GHG emissions while maintaining optimal crop production.  Particularly, it is important to quantify N2O emissions in fields fertilized with N sources and subjected to elevated atmospheric CO2 levels.  The objective of this study was to assess N2O emissions in tomatoes grown under both ambient and elevated CO2 levels and fertilized with Urea Ammonium Nitrate and Calcium Ammonium Nitrate.  The tomatoes were irrigated with a sub-surface drip irrigation system.  In elevated CO2 plots, CO2 was applied through surface drip lines.  A system’s approach that considers N fertilization, crop N use, N loss as N2O, and soil physical and chemical properties was employed.  Data of ancillary variables, such as soil moisture and temperature, known to affect N2O emissions were also collected.  Static flux chambers and a Photoacoustic Field Gas-Monitor were used for N2O emission measurements before and after fertilization events.  Daily levels of atmospheric CO2 within the plant canopy were monitored using a CO2 Analyzer.  Comparison of N2O emissions observed as a result of N fertilization events during the 2010 tomato growing season will be presented.
See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nutrient Losses