A 12×60 cm tractor boom sprayer overlaps successive passes by 30 cm at 4.2 km/hour. Turning losses are7.5 min/ha. Assume no overlap between adjacent nozzle sprays. Find field efficiency in percent, to two decimals.
Nominal width=7.2 m; effective width=6.9 m. Travel time per hectare is 10/(4.2×6.9)=.34507 h. Add .125 h turning time; actual capacity=1/.47007=2.12736 ha/h. Theoretical capacity=4.2×7.2/10=3.024 ha/h. Efficiency=actual/theoretical×100=**70.35%**.
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