Cadmium-enriched sewage sludge application to acid and calcareous soils: effect on yield and cadmium uptake by lettuce and chard
Eight soils with pH values ranging from 4.8 to 7.8 were treated with 1% sewage sludge amended with variable amounts of CdSO/sub 4/. The concentration of Cd in the soils ranged from 0.1 to 320 ..mu..g Cd/g. Lettuce (Lactuca sativa var. longifolia) and Swiss chard (Beta vulgaris var. cicla) were grown to maturity in pot cultures on the treated soils to determine the effect of soil pH on yield and Cd uptake. Fifty percent yield decrements for acid and calcareous soils, respectively, were associated with the following concentrations of Cd in soil: lettuce 214 and 139 ..mu..g/g; chard 175 and 250 ..mu..g/g. Tissue concentrations of Cd associated with the 50% yield decrement for acid and calcareous soils, respectively, were as follows: lettuce 470 and 160 ..mu..g/g; chard 714 and 203 ..mu..g/g. Multiple regression analysis of yields as a function of pH, CEC, % CaCO/sub 3/, % organic carbon (OC), % sand-silt-clay, and Cd addition rate revealed a highly significant yield relationship with Cd addition rate, % OC, % clay, and pH (lettuce: R/sup 2/ = 0.82; chard: R/sup 2/ = 0.93). Leaf Cd was significantly related to soil parameters as follows: lettuce-saturation extract Cd and CEC, R/sup 2/ = 0.82; chard-saturation extract Cd and pH, R/sup 2/ = 0.89. 40 references.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 5227029
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 7:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CADMIUM SULFATES
BIOLOGICAL EFFECTS
LETTUCE
PLANT GROWTH
CALIFORNIA
CLAYS
DTPA
EXPERIMENTAL DATA
FOLIAR UPTAKE
FOOD CHAINS
PH VALUE
PRODUCTIVITY
SAND
SEWAGE SLUDGE
SOIL CHEMISTRY
SOIL MECHANICS
SOILS
AMINO ACIDS
CADMIUM COMPOUNDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMISTRY
DATA
DRUGS
FEDERAL REGION IX
FOOD
GROWTH
INFORMATION
MECHANICS
NORTH AMERICA
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PLANTS
RADIOPROTECTIVE SUBSTANCES
SEWAGE
SLUDGES
SULFATES
SULFUR COMPOUNDS
UPTAKE
USA
VEGETABLES
WASTES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)