Great Plains 3P806NT Material Rate User Manual
Page 9
Great Plains Manufacturing, Inc.
Main and Dual Box Seed Rate
7
2011-10-21
151-143B
12. Turn crank at a steady rate for the number of turns
specified on page 2, or until one tenth acre or
hectare is tallied on acremeter. While turning, check
that cups have ample seed coming into them.
13. Weigh metered seed. Subtract initial weight of
container(s).
14. Divide the net seed weight by three. Multiply by
number of openers on your drill, and then by ten, to
determine the total of pounds per acre seeded.
15. The Seed Rate Handle scale is a percentage of
meter opening, and its effect is linear near scale
center. Calculate a new scale setting based on the
test.
Set the Seed Rate Handle to the new scale setting.
16. 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).
17. With calibration complete, store calibration crank,
reinstall any removed chains or sprockets and
reconnect seed hoses.
18. Check that your tire(s) is(are) properly inflated. See
“Tire Inflation Chart” in Operator manual.
When drilling, check seeding rate by noting acres drilled,
amount of seed added to drill and seed level in drill box.
If you are seeding more or less than desired, adjust rate
slightly to compensate for field conditions.
3P806NT crank rotations for
1
⁄
10
th
acre:
31
Example: the containers weighed a total of
2.98 pounds after test. NetWeight is:
1.48 lbs net
1.48
2.98
1.5
–
=
NetWeight
GrossWeight
ContainerWeight
–
=
Example: MeasuredRate is:
64 lbs/ac
64.3
1.48
3
----------- 13 10
Ч
Ч
=
MeasuredRate
NetWeight
SampledRows
-------------------------------------- OpenerCount
Ч
10
Ч
=
For example:
the target rate was 60 lbs/ac, and the initial scale 48:
the NewScale setting is:
45
44.8
60
64
------ 48
×
=
NewScale
TargetRate
MeasuredRate
--------------------------------------- PreviousScale
Ч
=