Great Plains 3N-3020P Material Rate User Manual
Page 5
196-248B
12/1/2009
Great Plains Mfg., Inc.
5
Checking Singulated Seeding Rate
The seed charts are based on cleaned and sized seed.
Extreme seed size variations, foreign material and tire
pressure will affect the seeding rate. Check the seed
population rate as described below.
1.
Adjust the planting depth to a shallow setting.
2.
Plant at the desired planting speed for a short dis-
tance.
3.
Using the table, determine how many rows need to
be counted.
4.
Measure a distance, according to the table, for the
row spacing in the planted area.
5.
Count the number of seeds, in the appropriate num-
ber of rows, over the distance measured.
6.
Multiply the number of seeds counted by 200 if
measuring for 1/200 acre or by 1,000 if measuring
for 1/1,000 acre. This is the plant population in
seeds per acre.
Example 1:
If you have a 10" row spacing drill, three rows must be
counted. Measure 17’ 5” and count the number of seeds
in three rows. If the number is, for example, 180, multi-
ply 180 by 1,000.
180 x 1,000 = 180,000 seeds per acre.
Example 2:
If you have a Twin Row 30" row spacing drill two rows
must be counted. Measure 87’ 1” and count the number
of seeds in two rows. If the number is, for example, 170,
multiply 170 by 200.
170 x 200 = 34,000 seeds per acre.
7.
If the planting population is significantly different than
desired, make the following checks:
• Double check the transmission and range sprocket
combinations. Refer to the seed population chart for
the seed being planted.
• Check the air pressure in the gauge wheel tires. Re-
fer to “Tire Inflation Chart” in the operator’s manual.
• Refer to the troubleshooting guide in the operator’s
manual.
Seed Rate Charts
Seed rate charts begin on page 6. The charts give trans-
mission sprocket combinations and drive range sprocket
combinations used to achieve desired population or
pounds per acre for each row spacing. The charts also
give seed spacing for singulated and volumetric seeds.
Planted Row Spacing
(Inches)
Number of Rows to
Count
Length of Row to Measure
for 1/1,000 acre
Length of Row to Measure
for 1/200 acre
7 1/2
4
17’5"
9 1/2
3
18’4"
10
3
17’5"
15
2
17’5"
87’1"
19
2
13’9"
68’9"
20
1
26’2"
130’8"
Twin Row 30 or 30
1**
17’5"
87’1"
Twin Row 36 or 36
1**
14’6"
72’7"
Twin Row 38 or 38
1**
13’9"
68’9"
Twin Row 40 or 40
1**
13’1"
65’4"
15 Skip Row or 17 1/7
2
15’3"
76’3"
**Count Twin Row as one row.
NOTE: Use 1/200 acre for populations less than 100,000 seeds/acre. Use 1/1,000 acre for populations above
100,000 seeds/acre.