Great Plains 3N-3020P Operator Manual User Manual
Page 43
4/23/2010
196-248M
41
Adjustments
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 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
number 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,
multiply 180 by 1,000.
180 x 1,000 = 180,000 seeds per acre.
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, 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” on page 107.
• Refer to “Troubleshooting,” page 48.
Seed Rate Charts
Seed rate charts begin on page 75. The charts give
transmission sprocket combinations and drive range
sprocket combinations for each row spacing, to achieve
the population or pounds per acre desired. The charts
also give seed spacing for singulated seed and maxi-
mum 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
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.