Great Plains 3P806NT Material Rate - Manual (Page 23)

Great Plains Manufacturing, Inc. Table of Contents Main Box Rates Native Grass Rate 21
2011-10-21 Table of Contents Main Box Rates 151-143B
Brome Grass Seeding
When the seeding material is strictly brome grass, you
can set an initial rate based on the tables following, and
then calibrate. You can also use the procedure for mixes
(page 17), but what follows is usually easier.
Refer to Figure 11
1.
Find the desired pounds per acre on the Brome
Grass Rate Charts on page 23. Determine which
Drive Type and Final Drive sprocket are required,
and for low rates, if Seed Rate Reduction is needed.
2. Set the Drive Type with the gearbox handle (see
“Setting Drive Type” on page 3).
3. Install the sprocket from storage on the right-hand
side of the Native Grass box. To change sprockets,
loosen the chain idlers and remove chain. Replace
with desired sprocket.
4. Fill three or more compartments at least half full of
seed at the outboard end of the box. Pull seed tubes
off the openers at rows to be sampled. This example
assumes three rows are used.
5. To perform this calibration, you need a scale that is
accurate at the aggregate sample size, and three (3)
light containers, each capable of holding the
expected SamplePerRow. Record the empty
container weights. The total is ContainerWeight.
6. Estimate the sample sizes. This example simulates a
full acre.
7. Raise the drill so the gauge wheel is out of ground
contact.
8. Remove the calibration crank from its storage stob.
Store the retaining pin on the stob.
9. Place the hex socket of the crank on the gearbox
input jackshaft (see page 2).
10. If the Main Box or optional Small Seeds box are
loaded, disconnect their drive or set their rates to
zero (unless you are simultaneously calibrating
multiple boxes).
11. Rotate the crank several turns to ensure that the
drives and seed cups are engaged, working properly,
free from foreign material, and that seed is flowing
steadily from the meters. Stop.
12. Note the current reading of the acremeter, unless
you do not plan to rely on it for the calibration.
13. Empty the sample containers back into the seed box,
and place them back under the three hoses to gather
metered seed.
Figure 11
Native Grass Final Drive Sprocket
18670
Example: You want to apply brome at a TargetRate of
12
1 ⁄
4
pounds per acre. The nearest chart rate is:
12.0
Standard Transmission,
Drive Type: 2
Final Drive: 22T
Example: 3 containers, each weighing 8 oz. (
1 ⁄
2
lb.).
ContainerWeight is 1.5 lb:
1.5 = 3 x 0.5
Crushing Hazard:
Install lift cylinder lock(s) on a raised drill.
SamplePerRow is 0.92 pounds:
ExpectedSample is 2.8 pounds:
0.94
12.25
13
--------------
=
2.8 0.92 3 ×
=
SamplePerRow
TargetRate
RowCount
------------------------------ =
ExpectedSample SamplePerRow SampledRows Ч =