Spray drift study for reducing environmental hazards and protecting crops is of high importance as the pesticides used today are more active and many are non-selective. The aim of this research was to design, construct and assess an intelligent system to measure the level of the spraying drift. The main parts of the system were liquid supply mechanism, pipes and nozzles, wind tunnel and electronic panel. A controlled pneumatic system was used to pressurize the liquid. The nozzle was displaced by a moving system connected to the controlling panel. The wind tunnel was constructed to provide and control the wind flow. To assess the performance of sprayer and drift of droplets, water sensitive papers were placed in different distances from the nozzle considering different environmental conditions. Experiments were performed in the wind speed of 12 km/h, three spraying pressure levels (3, 4 and 5 bar) and three nozzle heights (0.35, 0.5 and 0.6 m). The evaluation results showed that the drift was increased with increasing of sparing pressure and nozzle height. The fewest amount of drift, 0.36%, was obtained at pressure and height of 3 bar and 35 cm, respectively. The largest droplet sizes were observed in the lowest spraying pressures and heights. According to the results spray technology plays an important role to optimize the spraying parameters, minimize the spraying drift and reduce the level of environmental pollutions.
کلید واژگان :sprayer, wind tunnel, drift, droplet size
ارزش ریالی : 600000 ریال
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