Great Plains YP1625 Operator Manual - Manual (Page 44)

40 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Checking Singulated Planting Rate
The seed charts are based on cleaned and sized seed.
Extreme seed size variations, foreign material and tire
pressure will affect the planting 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. Count the number of seeds, in the appropriate num-
ber of rows, over the distance measured.
6. Multiply the number of seeds counted by 200 if mea-
suring for
1 ⁄
200
acre or 1,000 if measuring for 1 ⁄
1000
acre. This is the plant population in seeds per acre.
Example 1: Single Row
If you have a 10in row spacing planter, according to the
chart, three rows must be counted. Measure 17ft 5in and
count the number of seeds in three rows. If the number
is, for example, 180, multiply 180 by 1,000.
Example 2: Twin Row
If you have a Twin Row 30in spacing planter, 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
by 200.
If the planting population is significantly different than
desired, make the following checks:
Double check the transmission and range sprocket com-
binations. Refer to the seed population chart for the seed
being planted.
Check the air pressure in the gauge wheel tire. See “Tire
Inflation” on page 118.
See “Troubleshooting” on page 65.
Seed rate charts
Seed rate charts are in the seed rate book. The charts
give transmission sprocket combination and drive range
sprockets for row spacing used, to achieve the popula-
tion desired.
Each seed chart has a corresponding page showing the
different drive ranges for that seed and a transmission
sprocket reference.
Note: Use 1 ⁄
200
acre for populations less than 100,000
seeds/acre. Use 1 ⁄
1000
acre for populations above
100,000 seeds/acre.
180 1 000 , × 180 000 SeedsPerAcre ( ) ,
=
170 200 × 34 000 SeedsPerAcre ( ) ,
=
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 1/2in 4 17ft 5in
9 1/2in 3 18ft 4in
10in 3 17ft 5in
15in 2 17ft 5in 87ft 1in
19in 2 13ft 9in 68ft 9in
20in 1 26ft 2in 130ft 8in
30in or Twin Row 30in 1
a 17ft 5in 87ft 1in
36in or Twin Row 36in 1 14ft 6in 72ft 7in
38in or Twin Row 38in 1 13ft 9in 68ft 9in
40in or Twin Row 40in 1 13ft 1in 65ft 4in
15in Skip Row 2 15ft 3” 76ft 3in
a. A twin row pair counts as one row.