engleski

Contribution of a field sprayer testing to safer and more effective spraying

The investigation of built-in exploitation potential change was carried out with 180 tractor spraying machines of different equipment level in regular exploitation conditions. In spite of high ehploitation potential of the spraying machines, widespread use of pesticide application is not carried out properly. The reasons of spraying quality reduction are based on disturbance of spraying machine technical parameters due to many years use and insufficient knowledge of all requirements and regulations the operator should stick to during work. By pump capacity measuring it was determined that most of the investigated pumps (75 %) had exploitation useful effect from 70 % to 100 %. The main reason of reduced capacity was insufficient revolutions of tractor PTO ussualy being 350-480 min-1. Of 135 investigated gauges four were faulty and others still had required precision. The most common causes of improper protection agent hydraulic mixing in a spraying machine reservoir are as follows: insufficient pump flow, shutting off of hydraulic mixing flow during work and selection of too wide flow spraying machine. Unproffesional nozzle choice and its use is frequent reason of unprecise application and unnecessary errors at work. Spray pattern measurements indicate that almost 70 % of the investigated spraying machines had precise spray distribution pattern. Human factor is more responsible here (improper nozzle built-in on spraying machine blade, use of inadequate type of spraying machine, wear, etc.) than nozzle built-in quality.

agricultural spraying machine; exploitation potential; pump; nozzle

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