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The system was tested for its uniformity co-efficient, emission uniformity, and manufacturing co-efficient of variation. The head discharge relationships at different operating pressure i.e. 0.5, 0.7, 0.9, 1.25 and 1.5 kg/cm2 for emitters were expressed and the best fitted model with highest R2 was determined. Results indicated from developed models for the pressure discharge relationship that the exponent of the pressure was less than and equal to 0.5 which indicated that the nature of flow from the dripper was not an orifice flow. Co-efficient of variation values of all considered drippers at different operating pressure falls under 0.04 to 0.1 concluded that drippers are of good quality. The Emitter flow variation is also less than 25% which is in an acceptable range. Emission uniformity ranged from 81.78 % to 83.38 % at 0.5 kg/cm2 to 89.36 % to 89.94 % at 1.5 kg/cm2 for different drippers. Co-efficient of uniformity ranged from 92.15 % to 94.36 % at 0.5 kg/cm2 to 95.25% and 96.21% at 1.5 kg/cm2 for different drippers. The uniformity co-efficient and emission uniformity increased while co-efficient of variation decreased as operating pressure increased for drippers.
Keywords: Coefficient of variation, Coefficient of uniformity, Emission uniformity, Discharge rate