Abstract
The respiratory activity of a cropland soil which received between 100 and 120 tonnes (dry) of municipal sludge ha−1 annually over a five year period, was examined manometrically. The soil contained an average of 34 mg Cd kg−1. Compared to soil from conventionally managed fields, the biological consumption of gaseous oxygen by sludge-treated soil was four times greater than its untreated conventionally fertilized counterpart. This enhanced level of biological activity was restricted to the surface 25 cm of soil at the disposal site. There was no indication that increased soil cadmium levels had impaired the overall respiratory activity of the sludge treated soil.
Published Version
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