|Fausey, Norman - Norm|
Submitted to: ASAE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: 7/18/1999
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Water table management is being utilized in a water quality remediation strategy for reducing the delivery of nitrate to surface waters from subsurface drains. The water table management system includes subirrigation during the growing season and controlled drainage during the non-growing season with free drainage for planting and harvesting. In a management system aiming to produce conditions conducive to denitrification, the evolution of nitrous oxide from agricultural soils may be an important environmental concern. Nitrous oxide evolution rates of soils in controlled-drainage and conventional-drainage corn-soybean agroecosystems were studied for two years. Closeable plastic chambers were sampled at 0, 30, and 60 minutes during sampling events for emitted soil gases. Samples were analyzed for nitrous oxide. Results indicate that nitrous oxide evolution is correlated to fertilizer N application and precipitation. Water table management had little effect on nitrous oxide emissions.