Great Plains 3P806NT Material Rate - Manual (Page 34)

32 3P806NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
151-143B Table of Contents Main Box Rates 2011-10-21
10. Note the current reading of the acremeter, unless
you do not plan to rely on it for the calibration.
11. Empty the sample containers back into the fertilizer
box, and place them back under the three hoses to
gather metered material.
12. Turn crank at a steady until one tenth acre is tallied
on acremeter or for the number of turns from the
charts on page 2.
13. Weigh metered material. Subtract initial weight of
container(s).
14. Divide the net material weight by the number of row
sampled. Multiply by number of openers on your drill,
and by 10 if a
1 ⁄
10
th
sample size was collected, to
determine the total of pounds per acre applied.
15. Divide the desired TargetRate by the MeasuredRate
to calculate a scale adjustment factor.
16. Multiply the scale setting just used (the
PreviousScale, which is the initial adjusted setting for
the first calibration run) times the CorrectionFactor to
obtain the next scale setting to use.
17. Reset the fertilizer rate adjuster based on the
settings at the new chart rate.
18. You may want to note the current scale setting and
repeat the calibration procedure at the new setting if
your results varied greatly from the desired field rate.
19. With calibration complete, store the calibration crank,
re-install any seed chain removed and reconnect
fertilizer hoses.
20. Check that your end-wheel tires are 5.70-8 8-Ply,
and properly inflated. See “Tire Inflation Chart” in
the Operator manual.
21. When drilling, check application rate by noting acres
treated, amount of fertilizer added to drill and
fertilizer level in drill box. If you are applying more or
less than desired, adjust rate slightly to compensate
for field conditions.
Crank rotations for one tenth acre is:
65.6
Example: GrossWeight is 3.69 pounds.
NetWeight is 2.19 pounds
2.19 3.69 1.5 – =
NetWeight GrossWeight ContainerWeights – =
Example: MeasuredRate is 95 lbs/ac
95
2.19
3
----------- 13 Ч
10
Ч
=
MeasuredRate
NetWeight
SampledRows
------------------------------------- RowCount Ч 10 Ч
=
Example: the TargetRate was 109 lbs/ac:
the CorrectionFactor is 1.15
1.15
109
95
---------
=
CorrectionFactor
TargetRate
MeasuredRate
-------------------------------------- =
Example: the previous scale setting was 60,
the next scale setting is 69.
69 60 1.15
×
=
NextScale PreviousScale CorrectionFactor Ч =