Metribuzin

Dissipation

Herbicide residue

Half life

Field study was carried out to determine the dissipation of metribuzin and its residues in soil and chilli. Vermicompost (2 t/ha) was used as organic amendments to enhance the degradation. Metribuzin was applied at single and double the dose of 500 and 1000 g/ha. The chilli variety ‘Krishna Jolokia’ was grown with a recommended practices. The recoveries obtained for untreated soil and chilli were in acceptable range of (80.6–85.7%) and (86.8–92.2%) of the metribuzin standards and spiked samples. The limit of detection (LOD) – 0.003 µg/g and the limit of quantification (LOQ) – 0.01µg/g in soil and chilli. The metribuzin residue level ranged 0.153 – 0.356 µg/g on the day of application of metribuzin and further degraded to 0.023 – 0.087 µg/g on the 21st day of application. However, the half-life of metribuzin was observed to be 7 and 10 days with single and double the dose of application of metribuzin. Metribuzin residues did not persisted in soil beyond 30 days after application and in fruits.