Great Plains 3P806NT Material Rate - Manual (Page 19)

2011-10-21 Table of Contents Main Box Rates 151-143B
Great Plains Manufacturing, Inc. Table of Contents Main Box Rates 17
Native Grass Rate
Setting Native Grass Seed Rate
The Series II Native Grass Box is for seeding fluffy,
native grass blends like Big Blue Stem, Indian Grass,
and Side Oats Grama.
Refer to Figure 7
Native Grass mixes are too variable for seed rate tables
to be useful. Seeding rate for Native Grass is determined
by calibration, and set by:
• Drive Type handle at the ground drive gearbox ,
• Driven sprocket at the Native Grass box, using a
sprocket from the storage tree , and;
• Rate Reduction kit (See manual 202-583M), using
an alternate set of ground drive gearbox output and
Native Grass jackshaft input sprockets.
Great Plains recommends that you calibrate and adjust
your drill to help insure an accurate seeding rate. Fine
rate adjustment is done with the Driven sprocket.
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.
The pounds per acre in the seed charts are based on
drills with 5.70-8 8-Ply ground drive tires. Be certain that
your tires are properly inflated (see Operator Manual).
To calibrate seed mix:
1. Know your intended field seeding rate in pounds per
acre.
2. Raise drill and install lift-assist lock(s).
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 2 on page 2
5.
Remove the calibration crank from its storage stob
on the left top side of the main toolbar.
Seeding Rate Risk:
Calibrate. All native grass mixes vary in weight, seed type, and
density. You must calibrate each mix.
Factors that affect seeding rates are: weight of seed, size of
seed, relative humidity and moisture content of the seed, ratio
of inert material to seed, different proportions of seed types
affecting density, tire configuration, tire pressure, and tire
slippage. The charts in this manual are based on factory tires
at recommended inflation.
Figure 7
Native Grass Rate Control
28378
1
a
2
3
b
1 a
2
b
3
For example:
You desire to plant at a TargetRate of:
32
pounds per acre
For example:
3 containers each weigh:
1.5 lb
or a total of:
4.5 lb.