Great Plains 2000 Material Rate - Manual (Page 17)

Great Plains Mfg., Inc.
15
05/30/2008 118-389B
Fertilizer Rate
Fertilizer application rates will vary with fertilizer type,
density and particle size. Relative humidity and field
conditions can also affect application rates. The chart
on this page is based on material with a density of 65
pounds per cubic foot (1.04 kg/L) and average particle
size. Initially set the rate according to the charts, then
calibrate the drill to your material as described below.
If your drill has two boxes, remember to repeat the fol-
lowing steps for each drill box.
1. Raise the drill with the tractor hydraulics so the
drive wheels are off the ground. Rotate the drive
wheels to see that the metering system is working
properly and free from foreign material.
Refer to Figure 5
2. From the chart, find the setting number for your
row spacing and desired application rate.
3. Rotate the gate adjustment knob until the indi-
cator is under the desired rate on the scale .
4. Check that your gauge-wheel tires are the correct
size (9.5L x 15 for 12- and 15-foot drills and
11L x 15 for 20-foot drills) and properly inflated.
See “Tire Inflation Chart” in Operator’s manual.
5. Record the weight of an empty container large
enough to hold the fertilizer metered for one acre.
6. Place several pounds of fertilizer over three fertil-
izer feed cups on the outside end of the drill box.
7. Pull the fertilizer tubes off of these three openers.
Turn the gauge wheels a few turns to fill the feed
cups with material. Continue to turn until fertilizer
drops to the ground from all three tubes.
8. Place a container under the three tubes to gather
metered fertilizer.
9. Turn the gauge wheel until for one acre. See chart
at right for your drill model.
10. Weigh the metered material. Subtract the initial
weight of the empty container. Divide by three.
Multiply by the number of openers on your drill for
total pounds-per-acre metered. If this figure is dif-
ferent than desired, reset adjustment knob accord-
ingly.
11. When drilling, check the rate by noting acres
drilled, amount of fertilizer added to drill and level
of material in drill box. If you are applying more or
less than desired, adjust the metering rate slightly
to compensate for field conditions.
Figure 5
Fertilizer Rate Adjuster
27256
1
2
IMPORTANT !
The fertilizer rate chart is for granular fertilizer with a
density of 65 pounds per cubic foot (1.04 kg/L). If you
are applying fertilizer with a different density, use the
density conversion chart.
Note: Fertilizer rate is independent of Drive Type and
Main Seed Rate settings
1
2
Drill
Model
Revolutions for One
Acre Hectare
12-foot 450 1112
15-foot 364 900
20-foot 283 699
Note: You may want to repeat the calibration procedure
if your results vary greatly from the chart.
MeasuredMaterial EmptyContainer –
3
--------------------------------------------------------------------------------------------- PoundsPerCup =
PoundsPerCup NumberOfOpeners × PoundsPerAcre =