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Soil Science Society of America Journal Abstract -

Differential Bonding of Potassium and Rubidium-86 in Soils of Differing Clay Type and Degree of Weathering1


This article in SSSAJ

  1. Vol. 44 No. 2, p. 425-428
    Received: June 27, 1979
    Accepted: Nov 16, 1979

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  1. D. J. Eckert and
  2. E. O. McLean2



A Clermont silt loam and Paulding silty clay were amended with three levels of K and one level of 86Rb. The soils were moist-incubated and leached with NH4OAc, followed by hot HNO3 extraction to remove more strongly bound cations. Both soils fixed added K against NH4OAc extraction, some of which K was also not quantitatively extracted by HNO3. The added 86Rb was found in NH4OAc extracts, HNO3 extracts, and in the soil residum following extraction. Addition of K to the Clermont soil forced 80Rb from the NH4OAc-extractable fraction to a “sink” in this soil not accessible to either extractant. Adding K to the Paulding soil had the opposite effect. Independent reactions of K and Rb and the influence of soil type on K-Rb interactions cast doubt on the possibility of using 86Rb as a tracer for K in soil systems.

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