Great Plains 2S-2600HDF Operator Manual v2 - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 53
2014-02-03 Table of Contents Index 195-069M
Setting Fertilizer Rate
The 2S-2600HDF fertilizer meters are driven from the
clutch shaft through a series of sprockets. This system is
independent of the seed meter drive, and is unaffected
by Drive Type. Fertilizer rate is adjusted by changing 1 to
3 sprockets on each drill section (2 sets total).
Fertilizer application rates vary with fertilizer type, den-
sity and particle size. Relative humidity and field condi-
tions can also affect application rates. The chart in the
Seed Rate Manual is based on fertilizer with average
particle size and a density of 65 pounds per cubic foot.
Initially set rate according to charts, then calibrate the
drill to your material as described on this page.
Perform initial setup and calibration for the left drill box.
Once final are determined, set the right box to match.
Accurately obtaining the desired application rate requires
four steps:
1. Adjusting target rate for large differences between
material and chart density.
2. Setting Range sprocket (from chart)
3. Setting initial Driver / Driven sprockets (from chart)
4. Calibration: checking actual application rate
Adjusting for Density
The fertilizer meter rate chart is based on fertilizer with a
density of 65 pounds per cubic foot (1.04 kg/liter). If your
fertilizer density is within a few percent of that, you can
skip this step and rely on calibration to determine final
Driver/Driven setup.
For larger variances, particularly with very low densities,
pre-compensating can simplify calibration, by choosing a
different target chart value for the application rate.
1. Find your actual material density. Normally, this
reported on the container in which it was supplied. If
not, weigh a known volume and calculate it.
2. Find your material Density in the table at right, and
the Conversion Factor below it.
3. Adjust your target application rate prior to consulting
the Fertilizer Rate Chart.
4. Consult the Fertilizer Rate Chart for the Adjusted
rate.
5. Calibrate using the sprocket setup for the adjusted
rate.
°
Density: lbs/cu-ft
(kg/liter)
45.0
(0.72)
50.0
(0.80)
55.0
(0.88)
60.0
(0.96)
Conversion Factor 1.45 1.30 1.20 1.10
Density: lbs/cu-ft
(kg/liter)
65.0
(1.04)
70.0
(1.12)
75.0
(1.20)
80.0
(1.28)
Conversion Factor 1.00 0.93 0.87 0.81
Example: Your fertilizer has a density of 45 pounds per
cubic foot, and you want to apply 100 pounds per acre
with your 7.5in drill.
Example: the adjusted 145 rate corresponds to a High
Range, and 17T/19T Driver/Driven final drive.
AdjustedRate TargetRate ConversionFactor
Ч
=
145 100 1.45 Ч =