Great Plains 1205NT Material Rate - Manual (Page 17)

Great Plains Mfg., Inc.
15
04/12/2007 150-131B
Fertilizer Rate
Fertilizer application rates will vary with fertilizer type,
density and particle size. Relative humidity and field
conditions can also affect application rates. Initially set
rate according to the charts, then calibrate the drill to
your material as described below.
Note: For drills built after October 1, 2005,
calibrate using gauge wheels or supplied
calibration crank.
For drills built before October 1, 2005,
calibrate using gauge wheels or order
calibration crank kit available through
your Great Plains Dealer.
1. To calibrate using gauge wheels, raise drill with
tractor hydraulics so drive wheels are off the
ground. To calibrate using supplied calibration
crank, attach crank to coupler on gauge wheel
jackshaft with retaining pin. Disengage lockout on
the drive wheels.
2. Rotate drive wheels or calibration crank to see that
metering system is working properly and free from
foreign material.
3. From the chart on page 16, find the setting num-
ber for your row spacing and desired application
rate. Rotate gate adjustment knob to the number
obtained from the chart.
4. Check that gauge-wheel tires are the correct size
and properly inflated. Refer to “Tire Inflation
Chart” in Appendix of Operator’s manual.
5. Record the weight of an empty container large
enough to hold fertilizer metered for one acre.
6. Place several pounds of fertilizer over three fertil-
izer drop tubes on outside end of drill box. Pull fer-
tilizer tubes off these three openers.
7. Turn gauge wheels or calibration crank a few turns
to meters with material. Continue to turn until fertil-
izer drops to the ground from all three tubes.
8. Place a container under the three tubes to gather
metered fertilizer.
9. Turn gauge wheel for 346 rotations (one acre).
Check that the three meters have plenty of fertil-
izer coming into them.
10. Weigh metered material. Subtract initial weight of
the empty container. Divide by three. Multiply by
the number of openers on your drill to determine
total pounds-per-acre metered. If this figure is dif-
ferent than desired, reset adjustment knob accord-
ingly.
Figure 6
1205NT Calibration Crank
23386
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.
Drill
Model
Revolutions for One
Acre Hectare
1205NT 346 855
MeasuredMaterial EmptyContainer –
3
--------------------------------------------------------------------------------------------- PoundsPerDropTube =
PoundsPerDropTube NumberOfTubes × PoundsPerAcre =
Note: You can also rotate the gauge wheel jackshaft by
means of a wrench or socket. If rotating gauge
wheel jackshaft, disengage the lockout on the
drive wheel and use same number of rotations
as for rotating drive wheel.