Performance of a Field Crop Sprayer Nozzle Used in Bangladesh

Abstract

This study was carried out during the period from July'97 to May 99 in the department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh. Naboti 910M was tested to evaluate its performances in the laboratory. The discharge increased significantly with the increase in pressure. The relationship between discharge and pressure was y = 470.58x^0.377. The angle of sprays increased significantly with the increase in pressure from 1 to 4 kg/cm² and then the spray angle changed with increasing pressure. They were statistically identical. The relationship between spray angle and pressure was y = 88.17x^{0 .130}. Curves of spray distribution flattened with increasing nozzle height, pressure and wind speed. Spray liquid distribution uniformity increased significantly with the increasing of nozzle height, pressure and wind speed. The nozzle showed 64.99% distribution efficiency at an interaction effect of pressure 6 kg/cm², nozzle height 60 cm and wind speed 2 m/s. Deposition decreased with the increase nozzle height and wind speed. The distribution uniformity of spray increased with increasing pressure and nozzle height. The lowest uniformity was found at 15 cm height and the highest uniformity was found at 60 cm of nozzle height at constant pressure. Distribution uniformity increased with increasing nozzle inclination from oº until it reached at 60° and then distribution uniformity decreased rapidly. The lowest value of distribution uniformity was 15.727% and it was found at combined effect of pressure 1 kg/cm² and nozzle height 15 cm and nozzle inclination. The highest value of distribution uniformity was 52.087% and it was found at combined effect of pressure 6 kg/cm² and nozzle height 60 cm.