The persistence of simazine, oxadiazon, napropamide, oryzalin and acetochlor in a sandy soil was monitored over a period of 60 days by means of a bio-assay. Sixty days after application 3% of simazine, 5% of acetochlor, 6% of oxadiazon, 53% of oryzalin, and 54% ofnapropamide, initially present, were detected in the 0-300 mm soil layer. Simazine, oxadiazon, acetochlor and napropamide leached. Oryzalin was resistant to leaching and showed the highest efficacy and therefore is the most suitable

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... use on sandy soils. The herbicides were more efficacious when applied in a 5 mm herbigation than in a 16 mm herbigation. The criteria established for herbigation on a sandy soil could be used as a guideline for light-textured soils.