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

Forestry Sciences Lab., Intermountain Research Station, U.S. Forest Service, Logan, UT 84321

R. E. Henderson, M. D. Breithaupt and C. L. Seale

Agronomy Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Center, Baton Rouge, LA

J. M. LaBauve

Martin-Marietta, Oak Ridge, TN

*Corresponding author.

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.

Received for publication February 8, 1989.

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