Author(s):

D Padhee, S Verma, SS Rajwade, H Ekka, SK Chandniha and SK Tiwari

Abstract: Accurate pesticide application from sprayers is essential in modern farming practice as it increased pest control, reduced pesticide costs and wastage, and greater environmental safety. Evenness of lateral distribution of liquid from a sprayer nozzle is one of the requirements of accurate pesticide application. Hence, a study was undertaken to evaluate the lateral distribution of liquid from four different spray nozzles NMD (N1), BCN (N2), Plastic speaker nozzle (N3) and NTM (N4)) on a horizontal spray patternator. The discharge rate, spray distribution pattern, spray angle of all the types of nozzles were measured with a pressure range of 2.5 to 3.5 kg/cm² at an interval of 0.5 kg/cm² at three different nozzle height (200, 400 and 600 mm). Considerable variations in pattern occurred between successive runs with individual nozzles: the coefficient of variation from four different nozzles ranged from 0.58 to 1.11 for nozzle N1, 0.71 to 1.12 for nozzle N2, 0.75 to 1.02 for nozzle N3 and 0.57 to 1.29 for nozzle N4. The laboratory test results also indicated that spray angle of the nozzles increased with increasing system pressure up to certain limit and then it decreased. Decrease in spray angle and increase in swath width was also observed with increase in nozzle height. It was observed that with the increment of operating pressure, the swath width was found to be increased. Maximum discharge rate of 2.96 l/min was recorded in the plastic speaker nozzle (N3) at the nozzle operating pressure of 3.5 kg/cm². Maximum spray angle of 96.7Ëš was observed with BCN nozzle (N2) at 200 mm nozzle height with an operating pressure of 3.5 kg/cm². The maximum swath width of 83.4 mm was found with plastic speaker nozzle (N3) at the nozzle operating pressure of 3.5 kg/cm² at 600 mm nozzle height.

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