Great Plains 2525P Material Rate User Manual
Page 6
118-960B
10/19/2010
Great Plains Mfg., Inc.
6
Checking Singulated Seeding Rate
The seed charts are based on cleaned and sized
seed. Extreme seed size variations, foreign mate-
rial 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
distance.
3.
Using the table below, 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.
Multiply the number of seeds counted by 200
if measuring for 1/200 acre or 1,000 if mea-
suring for 1/1,000 acre. This is the plant pop-
ulation in seeds per acre.
Example 1:
If you have a 9 1/2-inch row spacing drill, accord-
ing to the table, three rows must be counted.
Measure 18’ 4” and count the number of seeds in
three rows. If the number is, for example, 180,
multiply 180 by 1,000.
180 x 1,000 = 180,000 seeds per acre.
Planted row
spacing
(inches)
Number of
rows to count
Length of row
to measure
for 1/1000
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"
30”
1**
17’ 5”
87’1"
Twin Row 36"
36”
1**
14’6"
72’7"
Twin Row 38"
38"
1**
13’9"
68’9"
Twin Row 40"
40"
1**
13’1"
65’4"
15" Skip Row
17 1/7"
2
15’3"
76’3"
Example 2:
If you have a Twin Row 30" spacing drill, according to the
chart, both rows of the twin row must be counted. Mea-
sure 87’1" and count the number of seeds in the parallel
row. If the number is, for example, 170, multiply 170 by
200.
170 x 200 = 34,000 seeds per acre.
NOTE: Both rows of the Twin Row count as one row.
6.
If 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 Troubleshooting in the operator’s manual.
Seed Rate Charts
Seed rate charts begin on the next page. The charts give
transmission sprocket combination and drive range
sprockets for row spacing used, to achieve the popula-
tion or pounds per acre desired. The charts also give
seed spacing for singulated seed and maximum planting
speed for both singulated and volumetric seeds.
Each seed chart has a corresponding page showing the
different drive ranges for that seed and a transmission
sprocket reference.
** 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.