Great Plains 2525P Material Rate - Manual (Page 7)

Great Plains Mfg., Inc.
5
03/23/2010 118-231B
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 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 measuring for
1 ⁄
1000
acre. This is the plant population in seeds per
acre.
Example 1:
If you have a 9
1 ⁄
2
in row spacing drill, according to the
table, three rows must be counted. Measure 18ft 4in
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.
Example 2:
If you have a Twin Row 30in spacing drill, according to
the chart, both rows of the twin row must be counted.
Measure 87ft 1in 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 popula-
tion chart for the seed being planted.
• Check the air pressure in the gauge wheel tires.
Refer 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 desired. The charts also give seed spacing and
maximum planting speed.
Note: USE
1 ⁄
200
ACRE FOR POPULATIONS LESS
THAN 100,000 SEEDS/ACRE. USE
1 ⁄
1000
ACRE
FOR POPULATIONS ABOVE 100,000 SEEDS/
ACRE.
Planted row
spacing
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
in 4 17ft 5in
8in 6 16ft 4in
9
1 ⁄
2
in 3 18ft 4in
15in 2 17ft 5in 87ft 1in
Twin Row 30in 30in 1 * 17ft 5in 87ft 1in
Twin Row 36in 36in 1* 14ft 6in 72ft 7in
Twin Row 38in 38in 1* 13ft 9in 68ft 9in
Twin Row 40in 40in 1* 13ft 1in 65ft 4in
* Count each pair in a twin row as a single row.