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Soil Science Society of America Journal Abstract -

Extractable Rubidium in Surface Horizons of Illinois Soils


This article in SSSAJ

  1. Vol. 56 No. 5, p. 1453-1454
    Received: Sept 13, 1991

    * Corresponding author(s):
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  1. R. Lewis Jones 
  1. Dep. of Agronomy, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801



Several studies suggest that extractable Rb at very low levels may play an important role in K activity. Rubidium extracted with normal neutral NH4OAc was determined in a suite of surface horizons to characterize its concentration relative to soil-forming factors and to extractable K. Mean extractable Rb (n = 59) was 138 µmol kg−1 soil, and accounted, on the average, for 1.31% of total Rb. Alfisols had significantly less extractable Rb than Mollisols, which was attributed to lower clay contents and a higher degree of weathering in the Alfisols. The mean atom percent of extractable Rb relative to extractable Rb plus K was 0.58% (range 0.07–1.40). Available K, as measured by the fertility quick-test procedure, was inversely proportional to the atom percent of extractable Rb, perhaps because a portion of the extractable Rb had occupied nonextractable sites in phyllocilicates with the addition of K fertilizer.

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