Reading a seed rate chart – Great Plains 3P806NT Material Rate User Manual
Page 7
Great Plains Manufacturing, Inc.
Main and Dual Box Seed Rate
5
2011-10-21
151-143B
Reading a Seed Rate Chart
1.
Find your seed. Charts are in alphabetical order by
common North American seed name. Scientific
names are provided. Charts covering more than one
seed may be out of order.
For Sudan, see Flax.
The example presumes Barley at 60 pounds/acre.
There are multiple chart sections for some seeds,
and the rates may overlap. Use the chart where your
desired rate is closest to 50 on the Seed Rate Han-
dle scale.
In the example, this would be Drive Type 2.
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 for the chart rate row chosen (at
left above rates). This number (1-4) is used to
determine the gearbox handle setting. See page 3.
In the example, this is
Drive Type 2
3.
Locate your desired seed rate in the table row for
your row spacing.
In the example the rate closest to 60 is:
64
4.
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 the example, start with a handle setting of:
50 (or interpolate to 48),
and calibrate. When a target rate falls halfway
between handle settings, you can adjust the handle
slightly to compensate, as in the example, but
calibration is apt to result in further adjustment
anyway.
Barley (Hordeum vulgare)
Seed Rate Handle Setting
32342
Seed Rate Handle Se
5
10
15
20
25
30
35
40
45
50
55
e Type: 1
Seed Rate in Pounds Pe
.7 6.3 8.4
11
14
17
20
24
27
31
35
e Type: 2
Seed Rate in Pounds Pe
0
13
17
22
28
35
42
49
56
64
72
T
S
R t
P
d P
32342
60
65
70
75
80
85
90
95 100
r Acre
(based on 51 pounds/bushel)
39
42
45
49
51
54
56
57
58
r A r
32342
0 4.7 6.3 8.4
11
14
17
20
24
27
31
Drive Type: 2
Seed Rate in Poun
0
10
13
17
22
28
35
42
49
56
64
Drive Type: 3
Seed Rate in Poun
32342
8.4
11
14
17
20
24
27
31
35
39
42
Seed Rate in Pounds Per Acre
17
22
28
35
42
49
56
64
72
79
86
Seed Rate in Pounds Per Acre
32342
Seed Rate Handle Setting
15
20
25
30
35
40
5
50
55
60
65
Seed Rate in Pounds Per Acre
8.4
11
14
17
20
24
27
31
35
39
42
Seed Rate in Pounds Per Acre
17
22
28
35
42
49
56
64
72
79
86
3
Seed Rate in Pounds Per Acre
32342