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Movement of Prometryne through Congaree Soil into Ground Water¹

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.

Key Words: Caparol 80W • time to one-half concentration • pore volumes of rainfall

¹ Technical contribution 1174, South Carolina Agr. Exp. Sta., Clemson University, Clemson, S. C. 29631.

² Associate Professor, Chemist III, and Chemist I, respectively, Clemson University.

Received for publication April 15, 1974.