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Behavior of Bromacil and Napropamide in Soils: II. Distribution After Application from a Point Source¹

ABSTRACT

The distribution of napropamide [2-(-naphthoxy)-N,N-diethylpropionamide] and bromacil (5-bromo-3-sec-butyl-6-methyluracil) when applied from a point source was determined in several soils. The parameters studied were application rate (4 and 1.5 L/h) and the effect of wetting and drying cycles. In general, napropamide, which was moderately adsorbed by the soils, was concentrated around the emitter; at a high application rate the compound moved laterally more than vertically and at a lower application rate it penetrated to a greater depth. After several cycles of wetting and drying, napropamide was partially leached out of the emitter zone into the soil volume, the amount of leaching being related to the soil texture. Bromacil, which was weakly adsorbed by the soils, was more uniformly distributed in the soil but did exhibit slight retardation in the heavier soils. The effect of application rate was similar to that observed for napropamide; however, after several cycles of wetting and drying, bromacil was completely leached from around the emitter in all soils and was concentrated at the outer edges of the wetted zone.

¹ Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel, no. 341-E, 1982 series.

² Soil Scientists, Div. of Soil Residues Chemistry, Inst. of Soils and Water, ARO.

Received for publication January 7, 1983. Accepted for publication January 7, 1983.