300 dpi: (d1548-1.jpg)
640 pixels wide: (d1548-1.jpg)
 Image Number D1548-1 |
Plant physiologist Fitzgerald Booker prepares to place an optical scanner into a tube positioned in the soil to photograph soybean roots. The photos will show changes in root growth caused by elevated carbon dioxide and ozone, pumped into the open-top field chambers.
Photo by Peggy Greb.
