Great Plains 3S-5000HDF Material Rate User Manual
Page 19
Great Plains Manufacturing, Inc.
Setting Fertilizer Rate
17
2012-06-04
195-325B
5.
Record the weight of one to three empty containers
collectively large enough to hold fertilizer metered for
6% of one acre.
6.
Place several pounds of fertilizer over three fertilizer
openings the outside end of the left drill box. Pull
lower end fertilizer hoses off of these drops at the
opener end.
7.
Turn gauge wheel several times to fill flute cups. Turn
until fertilizer drops to ground from each hose.
8.
Place empty container(s) under the three hoses to
gather metered fertilizer.
9.
Turn gauge wheel until one acre is tallied on
acremeter (see table at right). While turning, check
that cups have ample fertilizer coming into them.
10. Weigh metered fertilizer. Subtract initial weight of
container(s).
11. Divide the net fertilizer weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre applied.
12. Subtract to calculate the difference between the
measured rate and the original target rate.
13. If a Density Adjustment was made (see page 14),
apply it to the variance.
For example:
three empty 1.8 pound containers weigh: 5.4 lbs
Possible Agricultural Chemical Hazard:
Follow
material
supplier
recommendations
for
safety
precautions in handling fertilizer.
Calibration
Gauge Wheel Rotations
Drill Model
Per Acre
Per Hectare
2S-2600/F/HD/HDF
3S-3000/F/HD/HDF
3S-4000/F/HD/HDF
3S-5000/F/HD/HDF
For example:
the three containers weighed a total of 10.0 pounds
after test: 4.6 lbs net
NetWeight
GrossWeight
ContainerWeights
–
=
For example:
a 63-row (7.5 inch) drill: 96.6 lbs/ac
96.6
4.6
3
------
63
×
=
MeasuredRate
NetWeight
3
-------------------------
RowCount
×
=
For example:
the target rate was 78 lbs/ac:
new variance=19
18.6
96.6
78
–
=
Variance
TargetRate
MeasuredRate
–
=
In the example, we are using 65 pound material, so no
correction factor is applied.
AdjustedVariance
Variance
CorrectionFactor
Ч
=