Investigations on the metabolic fate of prochloraz in soil under field and laboratory conditions

✍ Scribed by Höllrigl-Rosta, Andreas; Kreuzig, Robert; Bahadir, Müfit

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 141 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199905)55:5<531::aid-ps939>3.0.co;2-u

✦ Synopsis

The degradation of prochloraz in different soils was investigated in ®eld and laboratory experiments. In laboratory degradation experiments in the dark, initial prochloraz concentrations decreased to 30±64% within 56 days, depending on temperature and soil pH. In neutral to basic soils, formation of up to 3.7% of the metabolite prochloraz-urea was observed. The rate of mineralization was strongly pH-dependent, not exceeding 3.2% in the acidic and 18.3% in the neutral to basic soils. Amounts of non-extractable residues ranged from 14 to 31%. Under ®eld conditions, prochloraz disappeared much more rapidly with DT 50 values of 11±43 days. The metabolites prochlorazformylurea and prochloraz-urea were found in signi®cant concentrations. Laboratory experiments with fresh and sterilized soils under UV irradiation con®rmed the enhancing effect of light on the formation of the primary metabolite, prochloraz-formylurea. The latter is hydrolysed to prochlorazurea predominantly by microbial degradation.