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Large amounts of nitrogen stored beneath selected agricultural areas
Date:5/2/2010

leaching accounted for most of the nitrogen lost from the soil, particularly in irrigated areas of California. Denitrification, a process where nitrogen is removed from the soil when it is converted to its gaseous phase, occurred only sporadically at the four sites because soils generally were sandy and well-drained.

The work is novel in that the model was autocalibrated to measured data comprising soil moisture, soil water tension, bromide and nitrate concentrations, and soil organic matter. Also, previous versions of the model were limited to the rooting depth of plants (typically three meters or less). The new version of the model can make predictions down to 30 meters, enabling estimation of water quality effects well beyond the root zone. More study is needed to better understand the conditions required to mobilize and transport the stored nitrogen to groundwater.


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Contact: Sara Uttech
suttech@sciencesociety.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

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