PERSISTENCE OF ISOPROPYL N-PHENYL CARBAMATE IN SOILS

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Abstract
Persistence was detd. by observations of emergence and response of oats, barley, and corn. Between 10 and 30[degree]C,the rate of disappearance of the compound increased with increasing temp. The compound disappeared equally rapidly from soils with moisture contents from 20 to 80% of the water-holding capacity and was slightly more persistent in soils at 100% of the water-holding capacity and in flooded soils. Under greenhouse conditions, at rates of 2, 10, 50, and 250 mg. per lb. of soil the compound disappeared in 15, 19, 39, and 39 days, respectively. The compound persisted more than 9 weeks in autoclaved soils and less than 2 weeks in nonautoclaved soils. The disappearance of this compound may have been due to the action of micro-organisms.