Abstract
The depressive effect of metoxuron which is sometimes observed on nitrifying bacteria, evolves with time to become harmless a month later, under laboratory conditions.
This phenomenon is explained by the present work carried out with two different soils, freshly sampled or airdried.
Metoxuron disappeared very quickly in the soil; the kinetics of disappearance were similar for the two soils studied.
This phenomenon, which results from a biological degradation, was not modified by supplying soil with ammoniacal nitrogen.