Image Number K7531-2

At a train derailment site near Bordulac, North Dakota, plant geneticist JoAnn Lamb and soil scientist Michael Russelle monitor the biological cleanup of nitrogen fertilizer with an unusual alfalfa. Yellowing leaves in the foreground indicate an area of cleaner soil because this alfalfa cannot use bacteria to extract nitrogen from the air.

Photo by Bruce Fritz

640 pixels wide: (k7531-2.jpg)