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Field Trial of Dolomitic Limestone as an In Situ Soil Remediation Technique to Reduce Nickel Toxicity in Soybean and Oat

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Title: Field Trial of Dolomitic Limestone as an In Situ Soil Remediation Technique to Reduce Nickel Toxicity in Soybean and Oat
Author: Cioccio, Stephen Christopher
Department: Department of Land Resource Science
Program: Land Resource Science
Advisor: Hale, Beverley
Abstract: As more contaminated sites are being discovered, new in situ remediation techniques need to be developed. Chemically treating soil with lime to increase soil pH is a method that may decrease the bioavailability of the contaminant. To test the usefulness of rendering metal-contaminated soils alkaline with dolomitic lime, to improve crop performance, field trials at a site in Port Colborne, ON, with soil nickel concentration (as high as 5000 mg/kg) from refinery emissions were completed. Oat and soybean yield, as well as plant uptake and bioavailabilty of nickel in soil were evaluated. Liming Ni-contaminated soils decreased soybean foliar Ni concentrations from 36.68 µg/g in unlimed fields to 19.98 µg/g in 50 t/ha limed fields in the 2007 growing season; yield of both oat and soybean in unlimed soils was the same (p>0.05) as at a reference site, suggesting that for these soils, remediation is not necessary for yield.
URI: http://hdl.handle.net/10214/4005
Date: 2011-06
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