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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K8334-1

As part of long-term experiments to learn the effects of different land-use sytems on crops and soils, chemist Chris Roager extracts nitrogen from soil samples taken from test plots at Pendleton, Oregon.

Photo by Scott Bauer.



640 pixels wide: (k8334-1.jpg)




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Last Modified: 5/23/2006
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