Great Plains 1520P Material Rate - Manual (Page 51)

12/1/2009 118-959B
51
Small Seeds Attachment
To set and calibrate the seeding rate on the op-
tional small seeds attachment, follow these
steps.
Set the seed-rate handle on the small seeds at-
tachment as indicated by the Small Seeds Rate
Chart on the next page.
Checking Volumetric Seeding Rate
The seed charts are based on cleaned seed
and 9.5L 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 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 ground.
3. Remove hose ends from the openers of the
three seed cups being measured.
4. Turn gauge wheel 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 metered.
6. Using the table on the right, turn drive
gauge selected number of 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 metered 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:
• Check to be sure all three seed cups are
covered with seed.
• Adjust seed-rate handle accordingly.
9. When finished reconnect seed hoses to op-
ners.
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
Equations for calibrating volumetric seeding rate:
measured seed empty container –
3 (number of meters measured)
----------------------------------------------------------------------------------------- pounds per meter =
pounds per meter number of openers
×
pounds per acre =