Fig. 6.

Comparison between soil culture and water culture with respect to ¹³⁷Cs uptake [1,2]. Rice plants were grown in soil and water culture. ¹³⁷Cs was supplied in both cultures, and the manner of uptake by the roots was compared using the real-time imaging system developed. In the case of the soil culture, the ¹³⁷Cs was firmly adsorbed onto the soil; thus, the ¹³⁷Cs was not absorbed by roots. However, in the case of the water culture, the ¹³⁷Cs was rapidly absorbed by the roots. Left: photo; right: autoradiograph after 3 h. The two plants on the left of each image were grown in water culture and the two plants on the right were grown in soil (N.I. Kobayashi et al.).