Great Plains 1300 13-Foot Material Rate User Manual
Page 9
Great Plains Manufacturing, Inc.
Main Box Seed Rate
7
2014-03-10
175-157B
25. Turn crank at approximately 23 rpm until one acre is
tallied on acremeter. While turning, check that cups
have ample seed coming into them.
26. Weigh metered seed. Subtract initial weight of
container(s)
27. Divide the net seed weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre seeded.
28. 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.
29. 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).
30. With calibration complete, store calibration crank, re-
engage lock-out hub, reinstall fertilizer chain (if
removed) and reconnect seed hoses.
31. Check that your end-wheel tires are 7.5 x 20, 4-ply
Rib Implement and 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.
Row Spacing
Rotations Per Acre (Ha)
6 inch (15.2 cm)
134 (331) rotations
7.5 inch(19.1 cm)
133 (329) rotations
10 inch (25.4 cm)
131 (324) rotations
Crank rotations for one acre:
133
23 rpm (2.6 sec/rev) simulates a 6.5 mph (10.4 kph)
planting speed.
For example: the containers weighed a total of 13.7
pounds after test:
8.3 pounds net
NetWeight
GrossWeight
ContainerWeights
–
=
8.3
13.7
5.4
–
=
For example:
on the 21-row 7.5in drill:
58 lbs/ac
MeasuredRate
NetWeight
3
-------------------------
OpenerCount
Ч
=
58.1
8.3
3
-------
21
Ч
=
For example:
the target rate was 60 lbs/ac, and the initial scale 47:
the new scale setting is:
49
NewScale
TargetRate
MeasuredRate
----------------------------------
OldScale
Ч
=
48.6
60
58
----- 47
Ч
=