Find your chart and rate, Dual hopper considerations, High rate flute considerations – Great Plains NTA3007 Operator Manual User Manual
Page 89: Adjustment for dual metering / high rate flutes, Adjustment for small seeds, Chartrate fieldrate lookupfactor, Calrate fieldrate twinfactor ч
Great Plains Manufacturing, Inc.
Adjustments
85
2012-07-02
166-371M
Find Your Chart and Rate
Standard “2 star” rates are in the main section of the
Seed Rate Manual. “3 star”, “4 star” and Small Seeds
rates are in the Appendix.
If you are planning to operate both hoppers, perform the
setup steps separately for each hopper, as the
configurations (including stars) may be completely
different.
1.
Confirm that the chart is for the material and star
configuration you have.
2.
Find your target population or application rate.
Note: If you have a choice of charts, for most consistent
results, pick one that results in a variable rate
gearbox value between 30 and 70.
Dual Hopper Considerations
If you are applying the same material from both hoppers,
what chart rate to start with depends on whether you will
run both meters simultaneously, or sequentially (run one,
then the other).
The charts do not account for “twin” hopper operation. If
both hoppers are metering the same material, at the
same rate, and at the same time, the output is twice the
chart rate. If run sequentially, or metering different
materials at the same time, treat them as single-hopper
operation.
High Rate Flute Considerations
“High Rate” charts are provided for some seeds, but the
charts do not cover all possible combinations of high-rate
flutes. You can use any standard-rate single-hopper
chart.
Adjustment for Dual Metering / High Rate Flutes
To find the initial chart rate for dual hopper and/or
alternate flutes:
To find the rate to check at calibration:
Adjustment for Small Seeds
Small Seeds rates are provided for some
a
, but not all
seeds that might be compatible with the optional
smaller/shallow flute shaft. If the seed has a chart for the
standard shaft, choose a chart rate that is about 500%
(5x) the desired field rate. The Small Seeds shaft meters
at between 20% and 50% of the standard shaft.
a. See “Tested Small Seeds” on page 158.
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Target Rate Adjustments
Hoppers for This Material
Single or
Sequential
Dual
Simultaneous
2 Stars
(std.)
Chart would be 1x rate
LookupFactor = 1.0
TwinFactor = 1.0
Chart would be 2x rate
LookupFactor = 0.5
TwinFactor = 0.5
3 Stars
Chart would be 1.5x rate
LookupFactor = 0.67
TwinFactor = 1.0
Chart would be 3x rate
LookupFactor = 0.33
TwinFactor = 0.5
4 Stars
Chart would be 2x rate
LookupFactor = 0.5
TwinFactor = 1.0
Chart would be 4x rate
LookupFactor = 0.25
TwinFactor = 0.5
For Example:
Drill: NTA907-4875
Crop: Barley (no high rate flute chart available)
Field rate: 500 kg/ha (above 2 flute chart coverage)
Flutes: 3 star
Metering: simultaneous dual hopper
165 = 500 x 0.33
Look up the settings for 165 kg/ha
ChartRate
FieldRate
LookupFactor
×
=
Continuing the example:
Field rate: 500 kg/ha
250 = 500 x 0.5
Calibrate each meter to 250 kg/ha
CalRate
FieldRate
TwinFactor
Ч
=