Environmental nitrogen analysis

Environmental nitrogen analysis

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Credit: PEGGY GREB/US DEPARTMENT OF AGRICULTURE/SCIENCE PHOTO LIBRARY

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Caption: Environmental nitrogen analysis. Technician preparing gas chromatograph samples for nitrogen gas analysis to estimate denitrification rates. During denitrification, microbes remove nitrate from shallow groundwater. The levels of carbon and nitrogen are a critical factor in assessing soils and the crops grown on them. This research is being carried out by the Agricultural Research Service of the US Department of Agriculture.

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