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Movement of Carbaryl through Congaree Soil into Ground Water¹

ABSTRACT

Carbaryl (25.4 kg/ha) 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 1 m of soil). The upper 1 m contained about 6% of the applied carbaryl after 16 months. No carbaryl was found in the 0–20 cm layer after the 4th month. Loss of carbaryl with time in the upper 1 m was concentration-dependent. Time to half-concentration within the upper 1 m was < 1 month.

Carbaryl appeared in the underlying ground water within 2 months after soil application and persisted through the 8th month. Maximum ground-water concentration, about 0.3 µmol/liter, occurred at the end of the second month.

Key Words: Sevin • time to half-concentration • pore volumes of rainfall

¹ Technical contribution 1229, South Carolina Exp. Sta., Clemson University, Clemson, SC 29631. Hatch Project 056.

² Professor, Agron. and Soils Dep., College of Agric. Sci.

Received for publication May 28, 1975.