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EC number: 200-521-5
CAS number: 61-82-5
Key study, guideline BBA Part VI, 1-1 (1987), Nitrification in
soils, Blumenstock (1989) :
NOEC >= 100 mg/L (in loamy sand and silt, based on nominal
concentrations). The influence of the herbicide on the nitrification was
of short duration only : the retardation of nitrification disappeared 90
days after treatment.
The aim of this study was to study the influence of 20 and 100 mg a.i.
of Aminotriazol Bayer/kg dry weight of soil, on the nitrification of
added ammonium, on two different soils.
Aminotriazol Bayer (50% of active ingredient Amitrole) was applied in a
dosage of 30 kg/ha (equivalent to ca. 40 mg formulation or 20 mg a.i./
kg dry weight of soil.
This amount of Aminotriazol Bayer and the 5-fold overdose induced a
slight reduction of nitrification in a loamy sand (0.84% org. C, pH
(KCl) = 5.3) and a silt (1.23 % org. C, pH (KCl) = 4.8). This effect had
disappeared within 90 days after treatment. According to the results
obtained in this study, a No Observed Effect Concentration (NOEC) >= 100
mg/L was found. In the treated samples of the loamy sand a small
increase in nitrate formation (which was due to a simulation of native
soil nitrogen) was measured at the end of the study. When applied as
recommended, Aminotriazol Bayer should have no meaningful effects on
nitrification in field soils.
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