Zinc, cadmium and manganese uptake by soybean from two zinc- and cadmium-amended Coastal Plain soils
- Maryland Environmental Service, Annapolis
Two Coastal Plain soils were used to evaluate the effects of organic matter and Fe and Mn hydrous oxides on Zn phytotoxicity, and on Zn, Cd, and Mn uptake by soybean seedlings. Fertilized Pocomoke sl and Sassafras sl were limed to pH 5.5 and 6.3 with CaCO/sub 3/ when adding Zn (six levens between 1.3 and 196 mg/kg at pH 5.5; seven levels between 1.3 and 524 mg/kg at pH 6.3). Cadmium was added at 1% of the added Zn. Beeson soybean (Glycine max L. Merr.) was grown 4 weeks, and the trifoliolate leaves evaluated for dry weight yield and for their Zn, Cd, and Mn concentrations. The higher organic matter Pocomoke soil was more effective than the Sassafras soil in reducing metal uptake, and Zn phytoxicity. Foliar Zn levels associated with yield reduction of soybean grown on Pocomoke differed with soil pH. Cadmium uptake was significantly lower on the Pocomoke soil. Foliar Mn increased to reported phytotoxic levels (> 500 mg/kg) with increased added Zn only on the Sassafras soil at pH 6.3. DTPA-extractable Zn and Cd were linear functions of added Zn and Cd for both soils; 0.01M CaCl/sub 2/-extractable Zn and Cd were curvilinear (increasing slope) functions for the Sassafras and linear for the Pocomoke soil. Thus, soil type can strongly influence Zn, Cd, and Mn uptake as well as Zn phytotoxicity to soybean. Soil organic matter appears to be more important than hydrous oxides of Fe and Mn in moderating the effects of excessive soil Zn and limiting Zn and Cd uptake. Induced metal toxicities (Mn) may depend on many factors, and should be considered an integral part of any characterization of specific metal phytotoxicities (e.g. Zn).
- OSTI ID:
- 5175630
- Journal Information:
- Soil Sci. Soc. Am. J.; (United States), Vol. 44:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
60 APPLIED LIFE SCIENCES
CADMIUM
ROOT ABSORPTION
GLYCINE HISPIDA
MINERAL CYCLING
MANGANESE
SOIL CHEMISTRY
BIOLOGICAL EFFECTS
ZINC
COASTAL REGIONS
IRON OXIDES
MANGANESE OXIDES
METABOLISM
SOILS
TISSUE DISTRIBUTION
CHALCOGENIDES
CHEMISTRY
DISTRIBUTION
ELEMENTS
IRON COMPOUNDS
LEGUMINOSAE
MANGANESE COMPOUNDS
METALS
OXIDES
OXYGEN COMPOUNDS
PLANTS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
UPTAKE
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
510100 - Environment
Terrestrial- Basic Studies- (-1989)
553000 - Agriculture & Food Technology