Great Plains 2SNG30 Material Rate - Manual (Page 13)

8/17/2006 202-499B
Great Plains Mfg., Inc. 13
Fertilizer Meter Rate
Fertilizer application rates will vary with fertilizer type, den-
sity and particle size. Relative humidity and field
conditions can also affect application rates. The chart on
the next 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 cal-
ibrate the drill to your material as described below.
If your drill has two boxes, remember to repeat the follow-
ing 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.
2. From the chart, find the setting number for your row
spacing and desired application rate. Rotate the gate
adjustment knob to the number obtained from the
chart.
3. Check that your gauge-wheel tires are the correct size
9.5L x 15 and properly inflated. Refer to Tire Inflation
Chart, “Appendix,” in the Operator’s manual.
4. Record the weight of an empty container large enough
to hold the fertilizer metered for one acre.
5. Place several pounds of fertilizer over three fertilizer
feed cups on the outside end of the drill box. Pull the
fertilizer tubes off of these three openers.
6. 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.
7. Place a container under the three tubes to gather me-
tered fertilizer.
8. Turn the gauge wheel until for one acre (approximately
225 tire rotations on a 24-foot drill and 182 rotations on
a 30-foot drill). Check that the three feed cups have
plenty of fertilizer coming into them.
9. Weigh the metered material. Subtract the 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 different
than desired, reset adjustment knob accordingly.
NOTE: You may want to repeat the calibration procedure if
your results vary greatly from the chart.
10. 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 de-
sired, adjust the metering rate slightly to compensate
for field conditions.
Seeding Drive Speeds
Refer to Figure 4
Important: When changing seeding drive speed for
faster or slower seeding, the fertilizer drive sprocket
must also be changed in order for the fertilizer rotor to
maintain consistent speed. The drawings below illus-
trate the proper sprocket arrangement when using both
types of seeding drive speeds.
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.
Figure 4
Sprocket Arrangements
22550