Great Plains 2515P Operator Manual - Manual (Page 39)

4/11/2005 173-208M
37 Adjustments
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 Table 1, determine how many rows
need to be counted.
4. Measure a distance of 17’ 5” in the planted ar-
ea.
5. Count the number of seeds, in the appropri-
ate number of rows, over the distance mea-
sured.
6. Multiply the number of seeds counted by
1,000. This is the plant population in seeds
per acre.
Example 1:
If you have a 15-inch row spacing bean machine,
according to Table 1, two rows must be counted.
Measure 17’ 5” and count the number of seeds in
two rows. If the number is, for example, 180, mul-
tiply 180 by 1,000.
180 x 1,000 = 180,000 seeds per acre.
Example 2:
If you have a 15-inch row spacing bean machine,
but desire to plant soybeans on 30-inch row spac-
ing, according to Table 1, one row must be
counted. Measure 17’ 5” and count the number of
seeds in one row. If the number is, for example,
180, multiply 180 by 1,000.
180 x 1,000 = 180,000 seeds per acre.
7. If the planting population is significantly differ-
ent 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. Refer to “Tire Inflation Chart” on page
81.
• Refer to Troubleshooting on page 45.
Planted row
spacing
(inches)
Number of
rows to count
Length of row
to measure
15 2 17’ 5”
30 1 17’ 5”
Table 1
Seed rate charts
Seed rate charts begin on page 66. The charts
give transmission sprocket combination and drive
range sprockets for row spacing used, to achieve
the population or pounds per acre desired. The
charts also give seed spacing for singulated seed.
Each seed chart has a corresponding page show-
ing the different drive ranges for that seed and a
transmission sprocket reference.