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Environmental Geochemistry and Health

, Volume 18, Issue 4, pp 135–142 | Cite as

Influence of fertilizer and sewage sludge compost on yield and heavy metal accumulation by lettuce grown in urban soils

  • S. B. Sterrett
  • R. L. Chaney
  • C. H. Gifford
  • H. W. Mielke
Article

Abstract

Previous research has demonstrated that many urban soils are enriched in Pb, Cd and Zn. Culture of vegetable crops in these soils could allow transfer of potentially toxic metals to foods. ‘Tanya’ lettuce (Lactuca sativa L.) was grown in pots of five urban garden soils and one control agricultural soil to assess the effect of urban-soil metal enrichment, and the effect of soil amendments, on heavy metal uptake by garden vegetables. The amendments included NPK fertilizer, limestone, Ca(H2PO4)2, and two rates of limed sewage sludge compost. Soil Cd ranged from 0.08 to 9.6 mg kg−1; soil Zn from 38 to 3490 mg kg−1; and soil Pb from 12 to 5210 mg kg−1. Lettuce yield on the urban garden soils was as great as or greater than that on the control soil. Lettuce Cd, Zn and Pb concentrations increased from 0.65, 23, and 2.2 mg kg−1 dry matter in the control soil to as high as 3.53, 422 and 37.0 mg kg−1 on the metal-rich urban garden soils. Adding limestone or limed sewage sludge compost raised soil pH and significantly reduced lettuce Cd and Zn, while phosphate fertilizer lowered soil pH and had little effect on Zn but increased Cd concentration in lettuce. Urban garden soils caused a significant increase in lettuce leaf Pb concentration, especially on the highest Pb soil. Adding NPK fertilizer, phosphate, or sludge compost to two high Pb soils lowered lettuce Pb concentration, but adding limestone generally did not. On normally fertilized soils, Pb uptake by lettuce was not exceptionally high until soil Pb substantially exceeded 500 mg kg−1. Comparing garden vegetables and soil as potential sources of Pb risk to children, it is clear that the risk is greater through ingestion of soil or dust than through ingestion of garden vegetables grown on the soil. Urban dwellers should obtain soil metal analyses before selecting garden locations to reduce Pb risk to their children.

Keywords

Zinc copper manganese iron lead cadmium nickel phosphorus limestone fertilizer sewage sludge compost 

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • S. B. Sterrett
    • 1
  • R. L. Chaney
    • 2
  • C. H. Gifford
    • 3
  • H. W. Mielke
    • 4
  1. 1.Virginia Polytechnical Institute and State UniversityPainterUSA
  2. 2.Environmental Chemistry LaboratoryUSDA-Agricultural Research ServiceBeltsvilleUSA
  3. 3.Eastwood Animal ClinicRutlandUSA
  4. 4.College of PharmacyXavier University of LouisianaNew OrleansUSA

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