Figure 2.--The pronounced image of this soybean plant on X-ray film is 
due to emanations from radioactive iron. The chlorosis-susceptible 
soybean was able to absorb the radioactive iron from a calcareous 
soil after the soil was treated with a chelate, DTPA. The image of 
roots, stems, and leaves shows that the iron was taken up and distri- 
buted evenly and amply throughout the plant. 
Gus 
