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United States Department of Agriculture

Agricultural Research Service

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Image Number D1533-6

In a nitrogen fertilizer source study, soil scientist Ardell Halvorson (right) and technician Mary Smith prepare gas samples from field sampling for gas chromatograph analysis of nitrous oxide, carbon dioxide, and methane.


Photo by Stephen Ausmus.

640 pixels wide: (d1533-6.jpg)

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Last Modified: 8/13/2016
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