Great Plains 1525P Operator Manual User Manual
Page 46
1525P, 1510HDP
118-949M
8/14/2006
44
Seed Rate Charts
Seed Rate Charts begin on page 96. The charts give
transmission sprocket combinations and drive range
sprockets for each row spacing, to achieve the popu-
lation 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 trans-
mission sprocket reference.
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
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.
Count the number of seeds, in the appropriate
number of rows, over the distance measured.
6.
Multiply the number of seeds counted by 200 if
measuring for 1/200 acre or 1,000 if measuring
for 1/1,000 acre. This is the plant population in
seeds per acre.
Example 1: Single Row
If you have a 10-inch row spacing drill, according to
the chart, three rows must be counted. Measure
17’5” 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: Twin Row
If you have a Twin Row 30” spacing drill, according to
the chart, both rows of the twin row must be counted.
Measure 87’1” and count the number of seeds in the
parallel row. If the number is, for example, 170, multi-
ply by 200.
170 x 200 = 34,000 seeds per acre
NOTE: Count Twin Row as one row.
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 popula-
tion chart for the seed being planted.
• Check the air pressure in the gauge wheel tires.
Refer to the “Tire Inflation Chart” on page 142.
• Refer to Troubleshooting on page 51.
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.