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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Not harmful to soil microorganisms

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The toxicity towards soil microorganisms was investigated in two Guideline studies, according to BBA VI, 1-1 (Effects on the Activity of the Soil Microflora; BBA Guidelines for the Official Testing of Plant Protection Products). One study concerned the effects of Diuron on soil respiration (Anderson, 1989) and the other on soil nitrification (Blumenstock, 1989); both studies investigated effects in both loamy soil and silt.

At the highest recommended rate of Diuron, there was no significant influence on either soil respiration or nitrification in either test substrate. Only after a 5 -fold overdose of Diuron did a temporary retardation of respiration occur (Anderson, 1989) and about a 30% reduction in nitrification (Blumenstock, 1989). Therefore, Diuron is not expected to have an adverse effect on soil microorganisms when being used as recommended.