ADSORPTION AND FIXATION OF COPPER IN SOME SANDY SOILS OF CENTRAL FLORIDA

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Abstract
The adaptation to the study of sandy soils of Florida of the method of Sieling [see B. A. 15(4): entry 9325] for the determination of soil exchange capacity was checked. As compared with the ammonium acetate method, extremely variable and generally low results were obtained. A study of Cu adsorption from Cu acetate solns. by 4 central Florida sandy soils was made. 3 of the soils adsorbed increasing quantities of Cu as the cone, increased. The amts. of Cu adsorbed by 2 samples of Norfolk fine sand at the highest cone, used were about 3 times the respective exchange capacities as detd. by the ammonium acetate method. Peech (Soil Sci. 51) recovered by a salt extraction only a small portion of the Cu added as sulphate to an acid Norfolk fine sand. In this work 6 Cu-saturated soil samples taken from Norfolk and similar series were used. Cu was removed continuously by salt solns. in appreciable amts. even after the passage of 1 liter of extractant through 50-gm. samples. NaCl soln. was more effective than BaCla2 and less effective than HC1 in the removal of adsorbed Cu. In mobilizing Cu in these soils, the dispersion of the organic matter to which it may be fixed appears important. The question remains as to whether this form of Cu can be adsorbed by citrus roots.

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