Bandara, R.M. U.S.Dissanayaka, H.M.M.K.K.H.De Silva, Y.M.S.H.I.U.Dissanayake, D.M.C.B.Witharana, D.D.2019-07-012019-07-0120189789550481194http://erepo.lib.uwu.ac.lk/bitstream/handle/123456789/1357/36-2018-Assessment%20of%20Environmental%20Impact%20of%20Selected%20Herbicides%20Used%20in%20.pdf?sequence=1&isAllowed=yEnvironmental hazard of pesticides are estimated using Environmental Impact Quotient (EIQ) method. Commonly used 12 herbicides were selected for the assessment of EIQ in order to know what the eco-friendly herbicides to be used. EIQ values were calculated for one hectare using EIQ calculator which is available online at http:// www. nysipm. cornell. edu/ EIQ Calc. Among the selected herbicides, Propanil 360 g/1 EC showed the highest field use EIQ of 41.2 having the biggest impact. Ethoxysulfuron 15% WG had the lowest field use EIQ of 0.1 with the lowest impact. Ecological impact of MCPA 600g/1 SL, MCPA 400g/1 SL and Glyphosate 360g/1 SL was also higher in comparison to other herbicides. AZi171 sulfiron 50% WG, Bispyribac sodium 100g/1, Bispyribac sodium 20% WP, Penoxulam 240g/ 1SC, Cyhalofop-butyl 100g/1, Fenoxaproppethyl 75g/1 EW, Ethoxysulfuron 15% WG and Carfentrazone-ethyl 240g/ 1 EC have shown lower field use EIQ and therefore they were more environmental friendly herbicides.enAnimal SciencesAgricultureAnimal ProductionAnimal Production TechnologyOther