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Image Number D2287-1

In a field of winter wheat in Beltsville, Maryland, ARS physical scientist Raymond Hunt (right) uses a camera that detects near-infrared, green, and blue light. Near-infrared and green light are needed to measure the “greenness” of vegetation and relate it to the crop’s nitrogen status. Dean Hively (left), a physical scientist with the U.S. Geological Survey at Beltsville, is measuring greenness with an “on-the-go” sensor available commercially.


Photo by Peggy Greb.

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