One hundred kilograms per hectare of toxaphene (octachlorocamphene) and 40 kg/ha of fluometuron (3‐[m‐trifluoromethylphenyl‐1,1‐dimethylurea) were applied to Dunbar topsoil in a field plot in the South Carolina Coastal Plain. Loss of both pesticides from the topsoil and accumulation in underlying ground water were monitored for 1 year.Toxaphene loss from topsoil seemed to occur in two stages. The second (major) stage was crudely linear on a log residue vs. log time plot. Half‐residence time in the topsoil was about 100 days.Fluometuron loss from topsoil occurred in one continuous episode that was crudely linear on a log residue vs. linear time plot. Half‐residence time in the topsoil was about 120 days.Toxaphene and fluometuron were found in underlying ground water within 2 months after they were applied to the topsoil. Both pesticides persisted in ground water during the entire year. Overall, concentrations gradually decreased with time.

No abstract

Prometryne [2,4‐bis(isopropylamino)‐6‐(methylthio)‐s‐triazine] (2.54 g/m2) was applied to a Congaree sandy loam fieldplot containing a shallow (about −1.1 m) water table. Movement and loss in the soil profile, and accumulation in underlying ground water were monitored for 16 months. Rainfall during this time was 182 cm (3.5 pore volumes, based on the upper meter of soil). The upper meter contained about 31% of the applied prometryne after 16 months. Prometryne concentration was greatest in the 0‐ to 20‐cm layer throughout the experiment. Loss of prometryne with time in the upper 1 m was almost independent of concentration. Time to one‐half concentration was about 10 months.Prometryne appeared in the underlying ground water within 2 months after soil application and persisted through the 16th month. It had disappeared from the ground water in a post‐experiment check made after 20 months. Maximum concentration (8th to 16th month) was about 0.2 µmol/liter.

No abstract