PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Editorial use only.
Nitrogen and carbon levels crop research. Technician conducting analysis of nitrogen and carbon levels in samples taken from cover crops and potato plants. 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 (ARS) of the US Department of Agriculture. Photographed in the USA.
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