Heavy metal contamination of soils and crops from auto traffic, sewage sludge, pig manure and chemical fertilizer

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The present paper describes heavy metal contamination of soils and crops resulting from auto traffic, sewage sludge, pig manure and chemical fertilizers, in three separate experiments.
The first experiment revealed that although the ADDT (average annual daily traffic) value of the Agricultural Area was lower, higher concentrations of Cu, Cd, Zn, Pb and Mn were obtained in soil when compared with the Commercial-Residential Area. Contaminations of trace metals from various source, e.g., chemical fertilizer, animal manure, night soil and pesticides of the nearby agricultural land were suspected.
The second experiment compared the effects of adding a commercial fertilizer and digested sludge which contain substantial amounts of various trace metals to a sandy loam for growing Chinese radish. The results indicated that repeated applications of the fertilizer elevated the contents of various trace metals in the roots of Chinese radish. The phenomenon was further aggravated when digested sludge was also incorporated.
The third experiment compared the contents of trace metals in the root and leaf tissues of tree seedlings (Acacia confusa) added with a single dose of the trace metalenriched fertilizer, and different portions of pig manure compost. It was revealed that the fertilizer-treated tree seedlings had a higher content of trace metals in the tissues than those amended with manure compost. Although the metal contents of soil increased as more manure compost was added, the contents in plant tissues did not increase correspondingly. Copyright © 1985 Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)139-149
JournalAgriculture, Ecosystems & Environment
Issue number2
Publication statusPublished - May 1985


pig manure
soil pollution
sewage sludge
trace elements
heavy metals
composted manure
Acacia confusa
residential areas
animal manures
plant tissues
agricultural land
fertilizer application


Wong, M. H. (1985). Heavy metal contamination of soils and crops from auto traffic, sewage sludge, pig manure and chemical fertilizer. Agriculture, Ecosystems & Environment, 13(2), 139-149. doi: 10.1016/0167-8809(85)90056-8