Great Plains 2S-2600HDF Operator Manual v2 - Manual (Page 61)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 57
2014-02-03 Table of Contents Index 195-069M
10. Divide the net fertilizer weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre applied.
11. Subtract to calculate the difference between the
measured rate and the original target rate.
12. If a Density Adjustment was made (see page 53),
apply it to the variance.
13. Consult the chart for the chart rate used for your first
calibration run with this material. If the just-measured
result was low, add the [adjusted] variance to the
previously used chart rate. If the measured result
was high, subtract the [adjusted] variance from the
previous chart rate.
14. Reset the fertilizer Range and Final Drive based on
the settings at the new chart rate.
15. You may want to repeat calibration procedure if your
results varied greatly from the desired target rate.
16. With calibration complete, Reinstall seed chain (if
removed) or reset Seed Rate Handle, reconnect
hoses, and lower gauge wheel to ground.
17. Set the right drill section to match the now-calibrated
left section.
When drilling, check fertilizer rate by noting acres drilled,
amount of material added to drill and material level in drill
box. If you are applying more or less than desired, adjust
rate slightly to compensate for field conditions.
When drilling, check metering rate by noting acres
drilled, amount of fertilizer added to drill and level of
material in drill box. If you are applying more or less fertil-
izer than desired, adjust metering rate slightly to com-
pensate for field conditions.
For example:
a 42-row (7.5in) drill: 82.6 lbs/ac
MeasuredRate
NetWeight
3
------------------------ RowCount
Ч
=
82.6
5.9
3
------ 42 Ч
=
For example:
the target rate was 78 lbs/ac:
new variance=5
Variance TargetRate MeasuredRate – =
4.6 82.6 78 – =
In the example, we are using 65# material, so no correc-
tion factor is applied.
AdjustedVariance Variance CorrectionFactor
×
=
For example:
Our measured rate was high, so we
subtract the variance (5)
from the chart rate (78)
to obtain a new chart rate (73).
This corresponds to a new drive setup of:
Low Range
21T Driving
18T Driven