Interactions of pesticides with substrates were studied. The adsorption of metalaxyl, oxamyl and carbendazim on unused pumice and rock-wool is much weaker than that on soils. The transformation rate of the pesticides in nutrient solution in contact with unused substrates is low. Metalaxyl is susceptible to microbial transformation in substrates containing plant roots, whereas oxamyl is susceptible to hydrolysis at somewhat higher pH values. Because of the low adsorption and often slow transformation,there is a risk of high residues in the crop and of substantial discharge with water to the environment.
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