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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K9918-1

Plant physiologist Carroll Vance evaluates roots of alfalfa, Medicago truncatula, as part of his efforts to help the crop fix more nitrogen and take in more phosphorus.

Photo by Keith Weller.



640 pixels wide: (K9918-1.jpg)




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Last Modified: 5/23/2006
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