Great Plains 2510HDF Operator Manual - Manual (Page 42)

38 1510HDF/2010HDF/2510HDF Table of Contents Index Great Plains Manufacturing, Inc.
288-340M Table of Contents Index 2013-11-11
Fertilizer Density Correction
The Fertilizer Rate charts in the Seed Rate manual are
based on a StandardDensity of:
65 pounds/cu-ft or
1.04 kg/liter.
If your material is substantially different, and/or if you
don’t intend to calibrate, calculate a CorrectedRate
before consulting the rate chart.
1. Obtain your material density from the packaging. If it
is not documented, you will need to weigh a known
volume of it, and convert the results to
pounds-per-cubic-foot or kilograms-per-liter.
2. Compute the correction factor.
3. Apply the correction factor to your desired
application rate.
4. Look up the setting for the CorrectedRate in the
Fertilizer Rate chart.
5. The CorrectedRate is used only to obtain an initial
setup for the rate adjuster. Calibrate to your real field
rate (the ActualRate).
Fertilizer Rate Calibration
Calibration is strongly recommended. Fertilizer density
and can granularity can be substantially different from
the material used to generate the chart.
Refer to sample data and formulas at right.
1.
Consult the rate chart for your material (after correct-
ing for density, if that step was completed).
2. Set rate adjuster on one of the drill boxes.
3. Record weight of an empty container large enough
to hold material metered for one acre for three rows.
4. Place several pounds of material over three fertilizer
cups on an outside end of a drill box. Pull delivery
tubes off of these three openers and route them to
container.
5. Raise the drill.
6. Rotate gauge wheel or calibration crank a few turns
to confirm gearbox has engaged and to confirm that
the fertilizer paths are free from foreign matter.
7. Turn gauge wheel several times to fill fertilizer cups
with material. Turn wheel until material falls from
each cup. Place materials collected so far back in
box.
Example Fertilizer Density Correction
Drill: 2010HDF-2410
Desired Application Rate (ActualRate): 60 lbs/ac
Fertilizer Density:
42 pounds per cubic foot.
CorrectionFactor:
65
÷ 42 = 1.55
CorrectedRate:
60 x 1.55 = 93 (pounds/acre)
The closest chart rate to 93 is 92.
Use adjuster setting: 50
CorrectionFactor
StandardDensity
YourDensity
-------------------------------------
=
CorrectedRate ActualRate CorrectionFactor ×
=
For example:
Drill: 2010HDF-2410
Assuming the material density corrected earlier:
ActualRate: 60 (pounds/acre)
CorrectedRate: 93
Rate Adjuster setting from chart:
50
Assume empty ContainerWeight of:
1.1 pounds