Persistence and biodegradation of vinclozolin in tropical rice soils

✍ Scribed by Banerjee, Anjana; Padhi, Sanhita; Adhya, Tapan K

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 84 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199912)55:12<1177::aid-ps70>3.0.co;2-0

✦ Synopsis

The persistence of vinclozolin in three tropical rice soils, widely varying in their physicochemical characteristics, was compared under both non-¯ooded and ¯ooded conditions. Degradation of the fungicide was more rapid in all the soils under ¯ooded conditions than under non-¯ooded conditions. Kinetic analysis indicated that the degradation of the fungicide followed a ®rstorder reaction irrespective of soil or water regime. Soil acidity and salinity signi®cantly affected the persistence of the fungicide under non-¯ooded conditions. The degradation of the dicarboxymide fungicide was enhanced following repeated applications to an alluvial soil under both water regimes, with the enhancement being more marked under ¯ooded conditions. Faster degradation of vinclozolin in mineral salts medium inoculated with non-sterile suspension from retreated alluvial soil indicates the involvement of micro-organisms. 3,5-Dichloroaniline was detected as a metabolite in the degradation of the fungicide in both soil and mineral salts medium.