Great Plains 1007NT Material Rate - Manual (Page 23)

07/08/2009 150-290B
Great Plains Mfg., Inc.
21
Native Grass Rate Calibration
Before completing these steps, review “Calibration
Overview” on page 2.
This Native Grass calibration works on any type of native
grass no matter what seed type, weight, or density. It
also does not require any particular initial drive setup.
The drill’s revolutions-per-acre at the native grass cup
allows you to calibrate the output in pounds by cup
sprocket revolution per acre.
To calibrate seed mix:
1. Know your intended field seeding rate in pounds per
acre.
2. Raise drill and install lift-assist locks.
3. Rotate the right ground drive wheel to see that feed
cups and drive are working properly and are free
from foreign matter.
4. Record the weight of one or more empty containers
large enough to hold seed metered from three rows
of the native grass box.
Refer to Figure 1 on page 2
5.
Remove the calibration crank handle from its storage
location on the left ground drive, and install it on the
left side of the right ground drive wheel.
6. Fill three or more Native Grass compartments at
least
1 ⁄
2
full of seed. Pull seed hoses off openers
under those compartments.
7. Turn gauge wheel or crank several times to fill seed
cups with seed. Turn wheel or crank until seed falls
to the ground from each cup.
8. Place empty container(s) under the seed tubes to
gather the seed as it is metered.
9. Note the Drive Type and Native Grass driven
sprocket. Also establish whether or not optional
Native Grass Rate Reduction is installed. This infor-
mation is needed for step 11 and for the calculations
later.
For example:
You desire to plant at:
32
pounds per acre
For example:
3 containers each weigh:
0.5 lb
or a total of:
1.5 lb.
For example, the drill is presently configured for:
Drive Type: 2
Driven Sprocket: 20T
Standard Range: (no Rate Reduction)