Great Plains 3S-4010HDF Material Rate - Manual (Page 9)

Great Plains Mfg., Inc.
7
01/29/2009 196-522B
Reading a Seed Rate Chart
Charts in U.S. customary units begin on page 8.
Metric charts begin on page 25.
1. Find your seed. Charts are in alphabetical order by
seed name. Charts covering more than one seed
may be out of order.
For Rape, see Alfalfa.
For Sudan, see Flax.
This example presumes we desire to plant Barley at
50 pounds per acre with a 7.5in drill.
There are multiple charts for some seeds, and the
rates may overlap. Use the chart where your desired
rate is closest to 50 on the Seed Rate Handle scale.
In our example, that would be Barley chart 2 of 3.
If your seed is not listed, find one with similar size,
shape and density. Density of the test seed used to
develop the chart appears under the right end of the
handle scale values.
2. Note the Drive Type in the upper left corner of the
chart for your seed. This number (1-4) is used to
determine the seed jackshaft sprocket. See page 3.
In our example, this is Drive Type 2 (34T sprocket).
3. Find your row spacing in the far left column.
4. Locate your desired seed rate in the table row for
your row spacing.
In our example, 49 is the closest to 50.
5. Note the Seed Rate Handle setting required, at the
top of the column at that seed rate. This is the initial
value set on the Seed Rate Handle. See page 4.
In our example, we will start with a handle setting of
40, and calibrate. When a target rate falls halfway
between handle settings, you can adjust the handle
slightly to compensate, but calibration is apt to result
in further adjustment anyway.