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Association of Cadmium in Durum Wheat Grain with Soil Chloride and Chelate-Extractable Soil Cadmium

W.A. Norvella, J. Wub, D.G. Hopkinsc and R.M. Welcha

a U.S. Plant, Soil & Nutrition Lab., USDA-ARS, Tower Rd., Ithaca, NY 14853 USA
b Dep. Crop and Soil Sciences, Cornell Univ., Ithaca, NY 14853 USA
c Dep. Soil Science, ND State Univ., Fargo, ND 58105 USA



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  		Fig. 1 Distribution of Cd concentration in 124 samples of durum grain. The proposed guideline level and maximum level for Cd in grain (Codex Alimentarius Commission, 1999) are shown for comparison

 


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  		Fig. 2 Relationship between Cd concentrations in durum grain and DTPA-extractable concentrations of Cd in soil. The solid line represents the indicated linear regression equation

 


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  		Fig. 3 Cadmium concentrations in durum grain as a function of three soil characteristics: water-extractable Cl-, water-extractable SO2-4, and DTPA-extractable Na. Solid lines represent the indicated regression equations

 


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  		Fig. 4 Three dimensional response surface for Cd in grain (Cdg) as a function of DTPA-extractable soil Cd (Cddtpa), and water-extractable soil Cl- (Clw). The surface is defined by Eq. [1]: Cdg = -0.06 + 1.07Cddtpa + 0.0686logClw

 




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