RESUMEN
Oxyfluorfen, a diphenyl-ether herbicide is being used to control annual and perennial broad-leaved weeds and sedges in a variety of field crops including onion. The present study was aimed to investigate the dynamics and field persistence of oxyfluorfen in onion plant, bulb and soil under Indian tropical conditions. Application of four rates of oxyfluorfen viz., 200, 250, 300 and 400 g AI ha(-1) as pre-emergence gave good weed control in field experiment with onion. The oxyfluorfen residue dissipated faster in plant than in soil respectively, with a mean half-life of 6.1 and 11.2 days. Dissipation followed first-order kinetics. In laboratory column leaching experiments, 17 percent of the applied oxyfluorfen was recovered from the soil and indicates its solubility in water and mobility in sandy clay loam soil was low. A sorption study revealed that the adsorption of oxyfluorfen to the soil was highly influenced by the soil organic carbon with the Koc value of 5450. The study concludes that the dissipation of oxyfluorfen in soil and onion was dependent on the physico-chemical properties of the soil and environmental conditions.
Asunto(s)
Éteres Difenilos Halogenados/metabolismo , Herbicidas/metabolismo , Cebollas/metabolismo , Contaminantes del Suelo/metabolismo , Cromatografía de Gases , Monitoreo del Ambiente , Semivida , Éteres Difenilos Halogenados/análisis , Herbicidas/análisis , India , Raíces de Plantas/metabolismo , Contaminantes del Suelo/análisis , Clima TropicalRESUMEN
Bioaccumulation of herbicides in plant produce may cause ailing effect on animals and human beings through food chain contamination. Thus oblige the investigation of newer herbicide metamitron for its persistence and degradation in sugar beet crop and soil. Metamitron persist in plant up to 15 days while up to 30 days in soil. Its dissipation followed first order reaction kinetics. On day 90, metamitron was detected in the soil at 7.0 kg a.i. ha(-1) treated plot only. It would be concluded that metamitron at 3.5 kg a.i. ha(-1) can be safely applied to the sugar beet crop for weed control.