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Wind tunnel tests provide one way in which the risk of drift from given nozzle conditions can be quantified but it is accepted that the use of field measurements and modeling approaches are also valid for determining a relative for Ex. Mix. Twin Fluid drift risk factor. The goals of present study assess the drift potential of the EMTF nozzles using wind tunnel tests, by comparing the drift profiles of sprays from EMTF nozzles those from standard fan nozzles.. As well as investigating to find the optimum combination for EMTF nozzles from the available nozzles in the marketing which may be producing the low drift. The current investigation research was carried out in the Federal Biological Research Centre for Agriculture and Forestry (JKI), Braunschweig, Germany. The wind tunnel was adapted at the optimum air conditions, 20° C air temperature and 80 % relative humidity. Eight drift-reducing external mixing twin fluid nozzles were evaluated in a wind tunnel to compare drift. Each tip was compared at 60 and 100 kPa liquid pressures, parallel to a 1, 2 and 3 m s -1 wind speeds, and at the 150 kPa air pressure for each. The results indicated that the external mixing twin fluid nozzles may be producing the low drift at low liquid pressure. The increase of liquid pressure tends to decrease the vertical drift and increase the DIX values. The optimum co-angling for EMTF nozzles was found at 45° that may reduce the drift potential and fallout of spray for all treatment conditions. The N5 (Lechler FT 5–608 & XR110s03 VK) nozzle may be able to reduce the low fallout airborne volume flux compared to Standard ISO nozzle and N1 nozzle which produced at 43.7 % DIX value. The DIX values at 100 kPa liquid pressures, co-angling 45°

DRIFT POTENTIAL FOR LOW PRESSURE EXTERNAL MIXING TWIN FLUID NOZZLES BASED ON WIND TUNNEL MEASURMENTS