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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The dissipation behaviour of Diuron under field conditions was investigated in four studies. After application of Diuron to bare soil at a rate of 8 kg a.s./ha at five locations in, DT50values of 55-236 days were determined (Pogány, 1993). A 3-year field trial in an apple orchard on loess type soil inwith 2, 2.5 and 3 kg Karmex 80/ha (applied always in May) did not show accumulation of biologically effective residues of Diuron (Pätzold & Brümmer, 1997). In a pear orchard on loam soil in, plots were treated with 3 kg a.s./ha (Rouchard et al., 2000). In the plots treated for the first time the soil half-life of Diuron in the 0-10 cm layer was 81 days. In the plots treated annually during the past 12 years, the corresponding soil half-life was 37 days. In the study by Tworkoski et al. (2000) an annual rate of 4.5 kg Diuron/ha was applied in field plots on asilt loam from 1981 to 1995. Residue concentrations decreased exponentially with time. By 125 days after treatment, Diuron residues were close to zero (< 1 % of initial levels, no accumulation took place). The DT50 values were about 40 days and 50 days in 1993 and 1994, respectively. Diuron thus showed a moderately enhanced biodegradation if applications were annually repeated.