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Solution Ion Activity and Plant Growth¹

ABSTRACT

The relation of ion uptake to soil solution composition is discussed. Uptake of a given ion depends not only on its activity in solution, but also on the activity of other ions and the relation that exists between solution ions and exchangeable or solid-phase ions. Methods of combining all these factors are reviewed and evaluated. A dimensionless plot, suggested by Howard and Adams, which related relative plant growth to the ratio of the ion activity to the sum of ion activities in solution, a_i/ⁿ₁a_i, seems to have a wide range of applicability that extends from uptake from a nutrient solution in a beaker to uptake from soil solution in situ.

¹ Contribution of the Soils & Fertilizer Research Branch, Division of Agricultural Development, TVA, Muscle Shoals, Ala. 35660. Presented before a joint meeting of Div. S-1, S-2, S-4, and S-9 of the Soil Science Society of America as part of a symposium, "The Soil Solution," during the ASA meetings in Tucson, Ariz., Aug. 24, 1970.

² Research Soil Chemist.

Received for publication November 30, 1970. Accepted for publication January 14, 1971.