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Defining Soil Buffer Power: Implications for Ion Diffusion and Nutrient Uptake Modeling

Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK S7N 0W0, Canada

N. B. Comerford and P. S. C. Rao

Soil Science Dep. 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611-0151

*Corresponding author.

ABSTRACT

Various definitions of the nutrient buffer power of soils, based on ion-exchange isotherms, have been proposed in the literature. However, incorrect definitions can result in erroneous estimations of solute diffusion coefficients and nutrient replenishment of soil solution, hence, rates of nutrient supply for plant nutrient uptake. This note presents conditions under which each definition of buffer power is valid, and situations where inherent assumptions may not be valid.

This work was funded by the Cooperative Research in Forest Fertilization (CRIFF) program. A contribution of the Florida Agric. Exp. Stn. Journal Series no. R-00002.

Received for publication June 26, 1989.

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