Great Plains 2020P Operator Manual User Manual
Page 41
4/23/2010
118-740M
39
Adjustments
Checking Singulated Seeding Rate
The seed charts are based on cleaned and sized
seed. Extreme seed size variations, foreign ma-
terial and tire pressure will affect the seeding
rate. Check the seed population rate as de-
scribed below.
1.
Adjust the planting depth to a shallow set-
ting. Plant at the desired planting speed for a
short distance.
2.
Using the table at the bottom of the page, de-
termine how many rows need to be counted.
3.
Measure a distance, according to the table,
for the row spacing in the planted area.
4.
Count the number of seeds, in the appropri-
ate number of rows, over the distance mea-
sured.
5.
Multiply the number of seeds counted by 200
if measuring 1/200 acre or 1,000 if measur-
ing 1/1,000. This is the plant population in
seeds per acre.
Example 1:
If you have a 10-inch row spacing drill, according
to the table, three rows must be counted. Mea-
sure 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, accord-
ing 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 ex-
ample, 170, multiply 170 by 200.
170 x 200 = 34,000 seeds per acre.
6.
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
130.
• Refer to Troubleshooting on page 47.
Seed Rate Charts
Seed rate charts begin on page 65. 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 maximum planting speed
for both singulated an volumetric seeds.
Each seed chart has a corresponding page show-
ing the different drive ranges for that seed and a
transmission sprocket reference.
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”
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.
** Count Twin Row as one row.