Find your chart and rate, Meter rate adjustment, Target rate adjustments – Great Plains ADC2220 Operator Manual User Manual
Page 71
Great Plains Manufacturing, Inc.
Adjustments
67
2012-10-17
167-073M
Find Your Chart and Rate
The rate charts in this manual, starting on page 75 are
based on metering from a single hopper, and the factory
standard “2 star” meter flute configurations.
If metering the same material from both hoppers at the
same time, the actual rate is twice the chart rate:
dual hopper metering: rate is 2
× higher than chart.
Example:
Both hoppers operating, and both set for 100 lbs/ac.
The total applied material is 100+100 = 200 lbs/ac.
If you have installed high rate flutes sets, adjust the
rates, in pounds/acre or kilograms/hectare, as follows:
3 stars: material rate is 1.5
× higher than chart,
4 stars: material rate is 2
× higher than chart
Small Seeds: material rate is
1
⁄
4
of the chart rate.
If using dual hopper and alternate flutes, actual rates are
3
Ч, 4Ч or
1
⁄
2
chart rates.
If you are planning to apply two different materials (such
as seed and fertilizer) in each hopper, 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.
2.
Find your target population or application rate.
Meter Rate Adjustment
Each meter box is set independently. Unless one is not
used, both need to be set for their material and rate.
Material rate is determined by:
• Quick Change Sprockets
• Meter Box Gears
• Gearbox Shift Level
The Seed Rate Manual charts are based on cleaned
untreated seed of average size and test weight. Many
factors affect meter rates including foreign material, seed
treatment, seed size, field conditions, and test weight.
Minor adjustments will be needed to compensate for
these factors. Initially set the rates according to the
charts, then calibrate for your material and conditions.
Target Rate Adjustments
To find the initial chart rate
In the example, the desired field rate was 200 lbs/ac.
100 = 200
× 0.5
Lookup settings for 100 pounds/acre in the charts.
Initially set each meter for a 100 pounds/acre rate, and
calibrate.
Material Rate Risk:
The adjustment factors above are approximate, and are merely
starting (test) values. You must calibrate (page 69) for
accurate field results. The Small Seeds lookup factors, for
example, vary from 3
× to 5.5× depending on seed variety,
meter rate and seed treatments.
Hoppers for This Material
Single
Dual
2 Stars (std)
Rate is 1
× Chart
Use chart rate
Rate is 2
× Chart
Lookup 0.5
×
3 Stars
Rate is 1.5
× Chart
Lookup 0.67
×
Rate is 3
× Chart
Lookup 0.33
×
4 Stars
Rate is 2
× Chart
Lookup 0.5
×
Rate is 4
× Chart
Lookup 0.25
×
Small Seeds
Rate is
1
⁄
4
Chart
Lookup 4
×
Rate is
1
⁄
2
Chart
Lookup 2
×
AdjustedRate
FieldRate
LookupFactor
Ч
=