MOVEMENT OF ALDRIN AND HEPTACHLOR RESIDUES IN A SLOPING FIELD OF SANDY LOAM TEXTURE

The residues of aldrin, dieldrin, heptachlor, and heptachlor epoxide were investigated in Woodville sandy loam soils that had been used for tobacco farming. Movement of residues in a field demonstrates that concentrations of residues can be directly correlated with the topography of the land. The decrease is greatest at points of highest elevation and less at lower levels. The mode of transportation of pesticide through the soil is discussed.