Residues in Vegetable Crops Following Soil Applications of Insecticides

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Abstract
Of 15 vegetables grown in soil treated with 10 pounds of chlordane per acre, only sweet potato, carrot, and rutabaga had residues in excess of 0.3 p.p.m. of 12 grown in soil treated with 20 pounds of DDT per acre, only potato, bell pepper, and table beet had residues. Potatoes contained 0.5 p.p.m. Of eight crops grown in soil treated with 42 pounds of ethylene dibromide per acre, table beet, onion, turnip, sugar beet, and lima bean straw showed residues of 9 to 76 p.p.m. Radishes grown in soil treated with 4 pounds of aldrin per acre contained no aldrin but 0.24 p.p.m. of dieldrin; no residue was detected from the same dosage of dieldrin. Sugar beets and table beets grown in soil treated with 3 pounds of toxaphene per acre showed 0.4 p.p.m. or less.

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