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This article in SSSAJ

  1. Vol. 54 No. 4, p. 1036-1042
     
    Received: Feb 8, 1989
    Published: July, 1990


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doi:10.2136/sssaj1990.03615995005400040018x

Unbuffered and Buffered Salt Methods for Exchangeable Cations and Effective Cation-Exchange Capacity

  1. M. C. Amacher ,
  2. R. E. Henderson,
  3. M. D. Breithaupt,
  4. C. L. Seale and
  5. J. M. LaBauve
  1. Forestry Sciences Lab., Intermountain Research Station, U.S. Forest Service, Logan, UT 84321
    Agronomy Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Center, Baton Rouge, LA
    Martin-Marietta, Oak Ridge, TN

Abstract

Abstract

This study was conducted to determine if a single unbuffered salt extractant for exchangeable bases and Al could be used in place of a buffered salt extractant for exchangeable bases and an unbuffered salt extractant for exchangeable Al. Barium chloride and a mixed NH4Cl-BaCl2 extractant were compared with NH4OAc for determining exchangeable bases and with KCl for determining exchangeable Al in soils. In general, BaCl2 extracted less exchangeable K than either NH4OAc or NH4CL-BaCl2. The NH4CL-BaCl2 extractant was equivalent overall to NH4OAc for extracting exchangeable bases and to KCl for extracting exchangeable Al, although less K was extracted by NH4Cl-BaCl2 at low levels of K for some Coastal Plain soils. The NH4Cl-BaCl2 extractant can be used by soil-test or soil-characterization labs as a simple one-step extractant in place of NH4OAc and KCl for the determination of exchangeable cations and effective cation-exchange capacity of soils.

Joint contribution from the U.S. Forest Service Intermountain Research Station and State Project 1836, Louisiana Agric. Exp. Stn. as Manuscript no. 88-09-2757.

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