Great Plains 2510HDP Operator Manual - Manual (Page 50)

46 1510HDP/2010HDP/2510HDP Table of Contents Index Great Plains Manufacturing, Inc.
118-245M Table of Contents Index 2013-10-21
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 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
correcting for density, if that step was completed).
2. Set rate adjuster on one of the drill boxes.
3. Record weight of one or more empty containers just
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(s).
5. Raise the drill.
6. Rotate gauge wheel a few turns to confirm that the
fertilizer paths are free from foreign matter, fertilizer
cups are full, and material is being dispensed
consistently. Place material collected so far back in
box.
Example:
Drill: 2510HDP-2910
Desired Application Rate (
ActualRate ): 60 lbs/ac
Example (step 1):
A gallon of your material weighs 5.6 lbs
A (U.S.Liquid) gallon is 231 cubic inches or
0.1337 cubic feet
42 = 5.6 / 0.1337
YourDensity = 42
Example (step 2):
1.55 = 65
÷ 42
CorrectionFactor = 1.55
CorrectionFactor
StandardDensity
YourDensity
-----------------------------------------
=
Example (step 3):
93 = 60 x 1.55
CorrectedRate = 93
CorrectedRate ActualRate CorrectionFactor × =
Example (step 4):
The closest chart rate to 93 is 92.
Use adjuster setting: 50
Example:
Drill and material from examples above
Assume empty ContainerWeight of:
1.1 pounds