Persistence of Pretilachlor in Coastal Rice Ecosystem

Field experiment was conducted to study the persistence of pretilachlor in soil and its residues in post harvest straw and grain. The residues of pretilachlor dissipated to below detectable level (BDL) with in 30 days after application when applied along wiih green leaf manure, while in other treatments viz pretilachlor at 0.75 kg ha⁻¹, pretilachlor at 1.5 kg ha⁻¹ alone and gypsum + pretilachlor at 1.5 kg ha⁻¹ persisted up to 45 days after application (DAA). The half-life of pretilachlor varied from 3.9–10.0 days. The analysis of terminal residues of pretilachlor in rice grain, straw and post harvest soil indicated that the residues were below detectable limit.