Abstract
SUMMARYThe amount of soil microbial biomass was measured by the chloroform fumigation technique on agricultural soils which had been previously treated with different bulky organic manures. Amounts of soil microbial biomass in soils receiving sewage sludge or sludge‐containing composts were much smaller than in soils which received farmyard manure over the same period. This effect was attributed to the toxic metals present in the sludges and was readily detectable more than 20 years after the last sludge application.
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