GREAT PLAINS 3N-3010, Operator'S Manual, Page: 110 / 118

106Great Plains | | 4/22/19 Table of Contents Index Great Plains | 106
196-366m Table of Contents Index Seed Rate Charts
Checking Volumetric Seeding Rate
The seed charts are based on cleaned seed and 11L x
15 rib implement tires and 13 x 5.00-6 contact drive
wheel tires. Factors including foreign material, seed
treatment, seed size, seed weight, field conditions and
tire pressure 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 measured from three cups for
one acre.
2. Place several pounds of seed over three seed cups
on an outside end of the small seeds box. Raise drill
off the ground.
3. Remove hose ends from the openers of the three
seed cups being measured.
4. Turn contact wheel clockwise a few turns to fill cups
with seed and until seed drops to ground from all
three hoses.
5. Place a container under the three hoses to gather
seed as it is measured.
6. Turn contact wheel clockwise 420 revolutions. Check
in box to make sure seed cups have plenty of seed
covering them.
7. Weigh measured seed. Subtract initial weight of
empty container. Divide by three for the amount
measured by each cup, 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 drive range sprocket combinations.
•
Check to be sure all three seed cups are covered
with seed.
•
Adjust seed-rate handle accordingly.
9. When finished reconnect seed hoses to openers.
19101
Range Sprocket
Equations for calibrating volumetric seeding rate:
measured seed empty container –
3 (number of cups measured)
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pounds per cup =
pounds per cup number of openers

pounds per acre =