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Air Pollution With Relation to Agronomic Crops: VII. Fluoride Uptake from Soils¹

Synopsis: Fluoride uptake by turnips and alfalfa from four soils was increased by addition of sodium fluoride and sodium fluorosilicate. Uptake was less from soils containing higher levels of clay, lime, and organic matter. Yields were generally reduced when fluoride absorbed from the soils reached levels exceeding 60 ppm in the shoots.

Under field conditions, fluoride contamination to plants apparently occurs directly from the air rather than indirectly by way of the soil.

² Graduate Assistant, Associate Professor, and Professor, respectively, Utah State University, Logan.