PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Editorial use only.
Soybean research. Plant physiologist preparing to place an optical scanner into a tube positioned in the soil to photograph soybean (Glycine max) roots. The photos will show changes in root growth caused by elevated carbon dioxide and ozone, which has been pumped into the open-top field chambers.
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