Great Plains 3P1006NT Material Rate User Manual
Page 29
Great Plains Manufacturing, Inc.
Small Seeds Rate
27
2011-10-21
151-144B
7.
If not already done, set the Small Seeds Rate
Handle.
8.
Load seed above the rows to be sampled. Load well
more than the expected sample size.
9.
Rotate the crank several turns to ensure that the
drives and seed cups are engaged, working properly,
free from foreign material, and that seed is flowing
steadily from the meters. Stop.
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 seed box,
and place them back under the three hoses to gather
metered seed.
12. Turn crank at a steady rate for the number of turns
specified on page 3 or page 4, or until one tenth acre
is tallied on acremeter. While turning, check that
cups have ample seed coming into them.
13. Weigh metered material. Subtract initial weight of
container(s).
14. Divide the net material weight by three. Multiply by
number of openers on your drill, and then by ten, to
determine the total of pounds per acre applied.
15. Divide the desired original field rate by the measured
rate to calculate a scale adjustment factor.
16. Multiply the scale setting just used times correction
factor to obtain the next scale setting to use.
17. Set the Small Seeds Rate Handle to the new scale
setting.
18. You may want to repeat calibration procedure at the
new setting if your results varied greatly from the
Seed Rate Chart, or if you must operate near the
ends of the Seed Rate handle scale (0-20 or
90-100).
19. Check that your tire(s) is (are) properly inflated. See
“Tire Inflation Chart” in the Operator Manual.
20. With calibration complete, store calibration crank,
reinstall any removed chains or sprockets and
reconnect seed hoses.
Example: planting alfalfa at 12 pounds/ac has an initial
small seeds rate handle setting of:
60
Crank rotations for one tenth acre is:
31
Example: the three containers weighed a total of
0.82 pounds after test, NetWeight is:
0.22 pounds
0.22
0.82
0.60
–
=
NetWeight
GrossWeight
ContainerWeights
–
=
Example: MeasuredRate is:
11 lbs/ac, lower than the target rate of 12.
11
0.22
3
----------- 15
Ч
10
Ч
=
MeasuredRate
NetWeight
3
--------------------------- RowCount
Ч
10
Ч
=
For example: the target rate was 12 lbs/ac:
the CorrectionFactor is:
1.1
1.1
˙
12
11
------
=
CorrectionFactor
TargetRate
MeasuredRate
--------------------------------------
=
For example: the previous scale setting was 60,
the NextScale setting is:
66
66
60
1.1
×
=
NextScale
PreviousScale
CorrectionFactor
Ч
=