Appendix
Spreading rate calculation
2018-9015-003
03-2015
Flow rate formula:
Spreader volume ÷ spreading time = liters/minute
Example: 14550 liters ÷ 3 minutes = 4850 litres/minute
Spreading rate formula:
Flow rate x 600 ÷ spreading width ÷ tractor speed = liters/hectare
Example: 4850 liters/minute x 600 ÷ 11.5 meters ÷ 9.6 km/h = 26359 liters/hectare
Spreading rate versus spreading speed:
● Determine the proper spreading rate according to your application in order
to define the tractor speed.
● Apply the rule of three as follows.
Tractor speed x required spreading rate ÷ monitored spreading rate = new
speed
Example: 9.6 km/h x 20000 liters/hectare ÷ 26359 liters/hectare = 7.28 km/h
To spread 20 000 liters/hectare of manure, the driver must maintain the tractor
speed to 7.28 km/h.