The radish (Kaiware daikon) was grown in the culture solution containing lanthanoid ions at 20°C. The absorption and release behavior of hydrogen, potassium and lanthanoid ions were examined during the germination and growing period of the radish. During the germination period (ca.30 h) from the seed in the culture solution of pH 5 at 20°C, the concentration of potassium ion increased, and hydrogen and lanthanoid ions decreased. On the other hand, in the growing period (ca.1 week), almost all potassium ion which liberated from the seed to the culture solution in the germination period was absorbed to the radish, and hydrogen and lanthanoid ions were released to the solution. The correlation coefficients of correlation between the concentration of potassium and lanthanoid ions were -0.96--0.99, -0.77--1.0 in the germination and growing period, respectively, and a good negative correlation was observed between them.
Furthermore, it was examined about the influence of the concentration of lanthanoid ions and the accumulation. As for the lower concentration than 1 ppm, it did not have an influence at all against the germination of radish and the growth. And these ions showed that it was often accumulated in comparison with the stem and the leaf of by a root. On the other hand, at concentration higher than 3 ppm of lanthanoid ions in the culture solution the radish germinated poorly and did not completely mature. When the concentration of lanthanoid ions were more than 10 ppm, a seed germinated a little, but did not grow at all.
From the above results, the positive effect of the lanthanoid ions on the growth of radish could not be admitted.

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