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This article in SSSAJ

  1. Vol. 59 No. 5, p. 1280-1288
     
    Received: Mar 25, 1994


    * Corresponding author(s): racz@bldgagric.lanl.umanitoba.ca
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doi:10.2136/sssaj1995.03615995005900050011x

Extraction of Manganese from Soils with Potassium Salts

  1. S. Tu,
  2. G. J. Racz  and
  3. C. M. Cho
  1. Dep. of Soil Science, Univ. of Manitoba, Winnipeg, MB, Canada R3T 2N2

Abstract

Abstract

Application of KCl usually increases the solubility of soil Mn and its bioavailability, yet the mechanisms of the phenomenon are not fully understood. The purpose of this study was to investigate the effects of KCl and salts such as KBr, KI, KNO3, K2SO4, K2CO3, K2HPO4, KH2PO4, Ca(NO3)2, Ca diethylenetriamine pentaacetic acid, and Cu(NO3)2 on the amount of Mn extracted from soils as affected by ionic strength, acidity of soil or extractant, and extraction time. The formation of anionic complexes of Mn and Cl in aqueous solution, using cation-anion-exchange resins, was also investigated. Amounts of Mn extracted by KCl from soils increased with increases in ionic strength and extraction time but decreased with increases in pH. The salts usually extracted more Mn from the noncalcareous than from the calcareous soils. The KI was capable of reducing MnO2 at normal soil pH, whereas Mn extracted by KCl was similar to Mn extracted by other neutral salts. The KCl-extractable Mn was highly correlated with readily soluble [Ca(NO3)2-extractable] Mn and weakly adsorbed (CaDTPA-extractable) Mn fractions, but not to the specifically adsorbed [Cu(NO3)2-extractable] Mn fraction. The Mn2+ in KCl solutions was shown to form anionic Mn-Cl complexes. These complexes, along with ionic strength effects, were most likely responsible for the increases in solubility of soil Mn.

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