Checking volumetric seeding rate – Great Plains 1525P Operator Manual User Manual
Page 45
8/14/2006
118-949M
43
Adjustments
Checking Volumetric Seeding Rate
The seed charts are based on cleaned seed
and 9.5 L x 15, rib implement tires. Factors in-
cluding foreign material, seed treatment, seed
size, seed weight, field conditions and tire pres-
sure will affect seeding rate. Set and check the
seeding rate, then readjust the rate as
necessary.
1.
Record the weight of an empty container
large enough to hold seed metered from
three meters for one acre.
2.
Place several pounds of seed over three
seed meters on an outside end of the drill
box.
NOTE: If drill box is full, shut off sliding seed
tubes to all but three meters on an outside end.
3.
Raise drill off ground.
4.
Turn gauge wheel a few turns to fill meters
with seed and until seed drops to ground
from all three openers.
5.
Place a container under the three openers
to gather seed as it is metered.
6.
Using the chart on the right, select your
row spacing and determine the correct
number of revolutions per acre. Turn drive
gauge wheel the selected revolutions for
your row spacing. Check in box to make
sure seed tubes have plenty of seed cover-
ing them.
7.
Weigh measured seed. Subtract initial
weight of empty container. Divide by three
for the amount metered by each meter,
then multiply by the number of drill openers
for the pounds-per-acre seeding rate.
8.
If seeding rate is different than desired:
• Double check transmission sprocket and
drive range sprocket combinations.
• Check for meter malfunction.
• Check for correct seed meter wheel.
• Check that all three rows are getting
seed.
• Refer to Troubleshooting on page 51.
9.
Readjust transmission and/or range
sprockets and repeat test.
Equations for calibrating volumetric seeding rate:
measured seed
empty container
–
3 (number of meters measured)
------------------------------------------------------------------------------------------
pounds per meter
=
Planted Row
Spacing (Inches)
Number of
Rows
Tire
Revolutions
per Acre for
15ft drills
7.5”
24
365
10”
18
365
10”
19
346
15”
12
365
15”
13
337
20”
9
365
20”
10
329
30”
6
365
Twin Row 30”
12
365
Twin Row 30” W/S
19
346