Effect of Sewage Sludge on the Composition of Corn Grain and Fractions Obtained by Dry-Milling

Kirleis, A.W.; Sommers, L.E.; Nelson, D.W.

Canadian Journal of Plant Science 62(2): 335-344


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps82-052
Accession: 068494218

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Corn grain grown on soil treated with sewage sludge at different application rates was dry-milled and the resulting fractions were analyzed for protein, ash, fat, Cd, Zn, Ni, Cu, Fe and Mn. The metal concentrations in whole kernel were not significantly increased by applying from 56 to 448 metric tons of sewage sludge per hectare. Except for one Cd-enriched sludge, Cd concentrations in whole corn and fractions from dry-milling were less than 0.05 mg/kg. As expected, the germ fraction contained the greatest proportion of the fat, ash and trace metals, while the majority of the protein was found in the grits fraction. Both the concentration and percent distribution of metals in dry-milling fractions decreased in the following order: germ > hulls > flour > meal > grits. For corn processed by dry-milling, the fractions used in animal rations will be more enriched in trace metals than those fractions normally used in human foods.