Residual Study of Metamifop 10 Ec in Grain, Straw and Soil in Direct Seeded Rice

Abstract

Field experiment was conducted to evaluate the efficacy of Metamifop in direct seeded rice. The treatments were metamifop at 50, 75, 100 and 125 g a.i ha-1 applied at 2-3 leaf stage of weeds;. Metamifop was also applied at 50, 75, 100, 125 and 200 g a.i ha-1 at 5-6 leaf stage. The residue of metamifop was determined in soil, grain and straw from plots where it was applied at 200 g a.i ha-1 at 5-6 leaf stage (T9) followed by the application of metamifop at 125 g a.i ha-1 at 5-6 leaf stage (T8) and application of metamifop at 100 g a.i ha-1 at 5-6 leaf stage (T7) Decrease in dose decreases the residue content. This might be due to the lesser degradation of the active substance. At the same time, for the same rate of application of 125 g a.i ha-1, the concentration of residue varies with the time of application i.e the mean residue of metamifop at post harvest soil was 0.031 and 0.048 ppm respectively in the plots which received metamifop at 2-3 leaf and 5-6 leaf stage. Application the metamifop at lower dose of 50 and 75 g a.i ha-1 did not show any residues i.e non detectable level.