Pendimethalin, Fluchloralin and Oxadiazon Residue in/on Onion

The residue of dimtroaniline (pendimethalin and fluchloralin) and oxadiazon herbicides applied pre-emergence @ 1.0 and 0.5 kg a.i. ha⁻¹ respectively in onion have been studied. The effect of 10 and 20 t FYM ha⁻¹ application on the levels of the herbicide residue has also been studied. At harvest the level of pendimethalin, fluchloralin and oxadiazon residue in onion bulbs ranged from 0.003 to 0.021, 0.004 to 0.036 and 0.080 to 0.104 ug g⁻¹, respectively. The residue were little higher at the 60lh d than at harvest. Marginal increase in the residue was observed with increased FYM application.