Use the following formula.
Pump output required (L/min)  = (Application rate (l/ha) x Speed (kmh) x Boom width (m))/600. Then allow 20% of the tank volume extra for agitation. 
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            Use the following formula.
Pump output required (L/min)  = (Application rate (l/ha) x Speed (kmh) x Boom width (m))/600. Then allow 20% of the tank volume extra for agitation.