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Rubidium-Potassium Relations in the Soil-Plant System¹

ABSTRACT

Potassium and Rb are taken up by plants in a constant ration to that in the substrate, when the substrate is a resin sand mixture. In soils the apparent independent reactions of K and Rb with the soil dominate the supply of these ions to the plant. These reactions tend to mask the competition that is presumed to occur between these ions in the ion uptake process. Increase in the rate of applied Rb was shown to decrease the percent of the added Rb fixed and markedly increase the percent of the added Rb taken up by the plant. High rates of applied K had only a slight effect on Rb uptake. Rubidium did not appear suitable as an "isotope" of K in soil studies.

¹ Contribution from the Eastern Soil & Water Management Research Branch, SWCRD, ARS, USDA, Beltsville, Maryland.

² Soil Scientists.

Received for publication April 16, 1959. Accepted for publication April 24, 1959.