Great Plains 1005NT Assembly Instructions - Manual (Page 21)

Great Plains Manufacturing, Inc. Operations 19
06/02/2008 123-535M
10. 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.
11. The Seed Rate Handle scale is a percentage of
meter opening, and is quite linear near scale center.
Calculate a new scale setting based on the test.
Note: If operating near scale extremes, do not calculate a
correction factor. Instead use the rate error to move
left or right in the chart to a new rate, and the use
scale setting for that rate.
Note: You may want to repeat calibration procedure 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).
12. With calibration complete, reinstall fertilizer chain (if
removed, and fertilizer to be applied), reconnect
seed hoses, and lower gauge wheel to ground.
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.
For example:
a 7.5in drill has 15 rows:
10.5 lbs/ac
MeasuredRate
NetWeight
3
------------------------ RowCount Ч =
10.5
2.1
3
------ 15
Ч
=
For example:
new scale:
48
NewScale
TargetRate
MeasuredRate
-------------------------------- OldScale Ч =
48
10
10.5
--------- 50 Ч =