A field investigation was conducted to study the effect of nozzle size, operating pressure and nozzle elevation on uniformity of application. The coefficient of uniformity was computed using the equations proposed by Christiansen (1942), Hawaiian Cane Society Specialists Hart and Reynolds (1965), Wilcox and Swailes (1947), Karmeli (1978), Criddle et al. (1956), Benami and Hore (1964), and Beale (1966).Uniformity of application (Coefficient of uniformity, distribution uniformity, system distribution uniformity & distribution characteristics) was determined at three operating pressures i.e. 2.5, 2.0 and 1.5 kg/cm2 with three nozzles elevations 150, 110 and 75 cm for 5.6, 4.7 & 3.1 mm nozzle size. Uniformity of application was determined with the help of catch can method. It was found from field study that Coefficient of uniformity, distribution uniformity, system distribution uniformity & distribution characteristics were increased with an increase in nozzle size (Except distribution characteristics was decreased for 5.6 mm nozzle), nozzle pressure & nozzle elevation from 75 to 110 cm but decreased for 150 cm nozzle elevation.

Keywords: Rotary Sprinkler, Uniformity of application, Nozzle Size, Operating pressure and Nozzle Elevation.