Great Plains 2525P Material Rate - Manual (Page 25)

Great Plains Mfg., Inc.
23
03/23/2010 118-231B
Checking Volumetric Seeding Rate
The seed charts are based on cleaned seed and 11L x
15, rib implement tires. Factors including foreign mate-
rial, seed treatment, seed size, seed weight, field condi-
tions and tire pressure will affect seeding rate. Set and
check the seeding rate, then readjust the rate as neces-
sary.
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 next page, select your row
spacing and determine the correct number of revo-
lutions 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
covering 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 rows 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 in the operator’s man-
ual.
9. Readjust transmission and/or range sprockets and
repeat test.
Calibration Equations
MeasuredSeed EmptyContainer –
3 NumberOfRows ( )
---------------------------------------------------------------------------------- PoundsPerMeter =
PoundsPerMeter NumberOfOpeners × PoundsPerAcre =