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Phytotoxicity and Uptake of Metals Added to Soils as Inorganic Salts or in Sewage Sludge¹

ABSTRACT

Crop growth and metal uptake on soil treated with inorganic salts of Cr, Cu, Zn, and Ni were compared with the results obtained when a sewage sludge was amended with these metals before addition to the soil. This mixture was then ground and added to the soil at the rate of 63 metric tons/ha (2.8%) solids. The treatments involving inorganic salts resulted in lower yields and, in general, higher metal concentrations than the equivalent sludge treatments. Lowest yields were generally observed for the high Zn treatment. These findings indicate that caution must be used when attempting to use results of inorganic salt treatments to evaluate phytotoxity and toxic metal uptake from sewage sludge amended soils.

Key Words: Zea mays L. • Seceale cereale L. • waste disposal • toxic metals • land application • Cr • Cu • Zn • Ni

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin; by research grants from the Janesville Water Pollution Control Utility, Janesville, Wis.; and the Wisconsin Department of Natural Resources.

² Research Assistant, Professor, and Research Associate, respectively, Dep. of Soil Science, Univ. of Wis., Madison, WI 53706. J. A. Ryan is presently with the Advanced Waste Treatment Research Laboratory, EPA, Cincinnati, Ohio.

Received for publication December 18, 1974.

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