Cadmium Sulfate Application to Sludge-Amended Soils. 1. Effect on Yield and Cadmium Availability to Plants

摘要

Twelve paired soils (only one of each pair having a history of sludge application) with pH values ranging from 3.9 to 7.4 were amended with CdSO4 in a growth chamber experiment. Three crops of Swiss chard (Beta vulgaris var. cicla) and one crop of corn (Zea mays L) were sequentially grown for 5 weeks in pot cultures containing the treated soils. Increasing Cd additions to the soils, whether as CdSO4 or in sewage sludge, resulted in increased Cd uptake by the plants, with the greatest accumulation of Cd by those plants grown on the acid soils. Liming the soils resulted in a decrease of Cd uptake by the two test crops. Regardless of soil pH, corn plants accumulated significantly higher concentrations of Cd than the Swiss chard plants. Results indicated that the added Cd was less available in the soils which had previously received sludge. (Copyright (c) Elserier Science Publishers B. V. 1987.)