1 Contribution from Centre for Soil and Crop Management Studies, Tamil Nadu Agricultural University, Coimbatore-641003
Pot culture studies were conducted to determine residues of herbicides applied for weed control in cotton in the previous season. Cucumber was found to be sensitive to the herbicide residues of fiuchloralin (1.0 kg/ha), oxadiazon (0.5, 1.0 and 1.5 kg/ha). Oxyfluorfen (0.1, 0.15 and 0.2 kg/ha) and pendimethalin (1.25 kg/ha). Fingermillet, fox tail millet and mungbean showed no sensitivity. Further pot culture study wiih known concentrations of the above herbicides was conducted to determine the regression coefficients and quadratic equations for the effects of herbicides residues on germination, plant height and drymatter production of cucumber. Quadratic function particularly with respect to plant height of cucumber was consistant with herbicide residues. Oxyfluorfen, oxadiazon and pendimethalin recorded residues in post-harvest soil.
