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To be done before spreading
78
Use a slide rule and
spreading chart decal
Now that the fertilizer type has been determined, the other data are
processed for the correct setting of the spreader.
Calculation of the flowrate
(lbs/min)
If you do not have access to the Internet, first calculate the dosing in
lbs/min that applies to your application rate, working width and driving
speed.
For this use
•
the discharge formula lbs/min.
•
or the slide rule.
Example 2:
You are going to spread with the following values:
Flowrate calculation formula
(lbs/min)
The calculation of the flowrate of fertiliser per minute in formula form
is:
The flowrate becomes 98 lbs/min.
Use this value for finding the correct setting value for your fertiliser
type on the spreading chart decal.
The machine has been supplied with a slide rule with which you can
easily determine the flowrate in lbs/min.
See paragraph »Determining the flowrate (lbs/min.) with the slide
Desired application rate (lbs/acre)
200
Desired working width (ft)
49
Desired driving speed (mph)
5
Type of fertiliser (-)
granular
Flowrate (lbs/min) =
500
Application rate (lbs/acre) x driving speed (mph) x working width (ft)
Flowrate (lbs/min) =
500
200 x 5 x 49