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Published in Soil Sci Soc Am J 35:72-78 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Properties Influencing DDT Bioactivity1

J. R. Peterson, R. S. Adams, Jr. and L. K. Cutkomp2

ABSTRACT

The study was conducted to determine the important soil variables affecting the bioactivity of DDT in soils to Drosophila melanogaster Meigen. Mathematical prediction equations were derived. Failure of the bioassay technique to be generally applicable necessitated division of the 31 soil samples used into two groups. The LD50 (lethal dose for 50% of the population) to D. melanogaster ranged from 43 µg DDT/g of soil in a Hubbard loamy sand subsurface sample to 790 µg/g in a Blue Earth silt loam subsurface sample. With one group of soils, a regression equation using organic carbon, fine clay, and 0.1N HCl extractable Fe contents and cation exchange capacity described 97% of the variability in LD50. With a second group of soils, exhibiting much higher DDT bioactivity, a regression equation using organic carbon content and field moisture capacity described 91% of the variability. The results indicated that sorption of DDT by soil organic matter was the principal means of deactivation.

NOTES

1 Scientific Journal Series no. 7257. Contribution Soil Science Dept., Agr. Exp. Sta., Univ. of Minnesota, St. Paul. Partially presented at the Soil Science Society of America meeting, Nov. 12, 1969.

2 Soil Scientist, Metropolitan Sanitary District of Greater Chicago. Chicago, Ill.; Associate Professor, Soil Science and Professor Entomology, Fisheries, and Wildlife respectively, Univ. of Minnesota, St. Paul.

Received for publication May 12, 1970. Accepted for publication September 22, 1970.






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