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Evaluation of Two Methods of Measuring Available Soil Copper and the Effects of Soil pH and Extractable Aluminum on Copper Uptake by Plants¹

ABSTRACT

The relationship between Cu uptake by millet grown in the greenhouse on 34 Kentucky soils and the available Cu in the soil as determined by the versenate procedure of Cheng and Bray and an adaptation of the dithizone procedure for Zn of Shaw and Dean was studied. The pH of the soil and the Al extracted by 0.1N CaCl₂ were also correlated with Cu uptake.

Highly significant correlations between both methods for available Cu and Cu uptake by the millet plants were obtained, but the relatively low values of the correlation coefficients indicate that neither procedure adequately measures available soil Cu. There was no correlation between soil pH and Cu uptake. Al extracted by 0.1N CaCl₂ was inversely correlated with Cu uptake. The uptake of Cu by wheat plants was decreased by Al concentrations of 0.4 to 1.0 ppm. in short term solution-culture experiments. An Al concentration of 0.1 ppm. appeared to increase the uptake of Cu.

¹ Contribution from the Agronomy Department, University of Kentucky, Lexington. Published with the permission of the Director of the Kentucky Agr. Exp. Sta. Presented before Div. IV, Soil Science Society of America, Aug. 7, 1958, at Lafayette, Ind.

² Formerly Graduate Assistant and Agronomist, respectively.

Received for publication November 11, 1958. Accepted for publication December 10, 1958.