Fenvalerate concentrations in a mineral and an organic soil receiving multiple applications during the growing season

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Abstract
Fenvalerate EC at 140 g AI[active ingredient]/ha was applied 7 times at 2 wk intervals to duplicate plots of Plainfield sand and an organic soil contained in 2.2 .times. 0.9 m field microplots with and without an onion crop present in 1980 and 1981, respectively. Soil samples were taken immediately before and after each application and at 2, 4 and 6 wk after the last application in 1980. Additional samples were taken at 22 and 34 wk for the 1981 treatment. Concentrations of fenvalerate were determined by GLC. In the crop-free mineral soil, fenvalerate levels declined from 0.07-0.11 ppm immediately after spraying to 0.01-0.03 ppm after 2 wk; in the organic soil the rate of addition of fenvalerate exceeded the rate of disappearance and the concentration in the soil gradually increased over the 14 wk treatment period to the 0.9-1.0 ppm range. This concentration decreased slowly over the next 10 wk to 0.7-0.8 ppm and was still 0.5-0.7 ppm the following spring. Results were similar for cropped soils. Concentrations in the top third of the 15 cm cores were 6- and 15-fold those in the middle third for sand and organic soil, respectively. Concentrations in the onions at harvest were < 0.01 ppm.