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The residues of metolachlor [2-chloro-2′-ethyl-N-(2-methoxy-1-methylethyl)-6′-methylacetanilide] applied to a soybean field were determined separately as to water-soluble and water-insoluble ingredients and were found to fluctuate with precipitation. The half life of all metolachlor was calculated as 40 to 60 days in 1990 and 4 to 5 days in 1991. The half life of the water-soluble ingredients, however, was as 6 to 12 days in 1990 and 3 days in 1991. Plant growth of Italian ryegrass in soils collected periodically after metolachlor application was inhibited, and this inhibition was closely related to the concentration of the water-soluble ingredients but little to that of the water-insoluble ingredients. This confirmed that the inhibition of plant growth by soil-applied metolachlor was induced by its water-soluble ingredients, while concentration of the herbicide in the soil water fluctuated little with the amount of precipitation, as different amounts of precipitation caused little variation in activity.

Herbicidal Activity and Residual States of Metolachlor in Upland Soil.