Great Plains 1007NT Material Rate - Manual (Page 9)

07/08/2009 150-290B
Great Plains Mfg., Inc.
7
11. Turn crank at approximately 60 rpm until one tenth
acre is tallied on acremeter. While turning, check
that cups have ample seed coming into them. The
number of revolutions per area is:
12. Weigh metered seed. Subtract initial weight of con-
tainer(s)
13. Divide the net seed weight by three. Multiply by num-
ber of openers on your drill to determine the total of
pounds-per-acre seeded.
14. The Seed Rate Handle scale is a percentage of
meter opening, and its effect is linear near scale cen-
ter. Calculate a new scale setting based on the test.
Set the Seed Rate Handle to the new scale setting.
15. 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).
16. With calibration complete, store calibration crank
handle, re-install fertilizer chain (if removed) and
reconnect seed hoses.
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.
Crank rotations for one tenth acre:
49.2
60 rpm (1 sec/rev) simulates a 6 mph (10.4 kph) plant-
ing speed.
Area Sampled Wheel Revolutions
Full Acre 491.6
49.2
Full Hectare 1214.8
121.5
1/10 th Acre
1/10 th Hectare
For example: the containers weighed a total of 2.6
pounds after test:
1.1 lbs net
1.1 2.6 1.5 – =
NetWeight GrossWeight ContainerWeights – =
For example:
on the 15-row 7.5in drill:
54.8 lbs/ac
54.8
1.1
3
------ 15 × =
MeasuredRate
NetWeight
3
------------------------- OpenerCount × =
For example:
the target rate was 60 lbs/ac, and the initial scale 45:
the new scale setting is:
49
49.3
60
54.8
--------- 45
×
= NewScale
TargetRate
MeasuredRate
--------------------------------- OldScale Ч =