Great Plains 3P1006NT Material Rate - Manual (Page 48)

46 3P1006NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
151-144B Table of Contents Main Box Rates 2011-10-21
Metric Native Grass Rates
For U.S. customary units, see page 22.
Formulas Metric Example
Know your Desired seed rate in pounds per acre:
TargetRate Example target seed rate:
40 kg per hectare
Choose the number of rows to sample. Example:
3
Weigh the empty sample container(s):
ContainerWeight Example container are three 680 gram buckets:
2.04 kg
For a larger sample, we set the Drive Type high. Suggested calibration Drive Type:
2
As there is only minor benefit in changing the final drive
sprocket for calibration, we leave it as is. Example final drive sprocket:
20T
Examine the transmission for Standard vs. Seed Rate
Reduction/ Example transmission: Rate Reduction not installed:
Standard
Operate crank/gauge wheel for one tenth hectare:
CalibrationRevs Example (s/n A1067W+):
34.6 revolutions (
1 ⁄
10
th
of 346)
Weigh the collected seed plus container(s):
GrossWeight Example:
GrossWeight = 2.96 kg
Obtain the net sample weight: Example:
0.92 = 2.96 - 2.04, or:
NetSample = 0.92
Determine the net sample weight per cup: Example:
0.92
÷ 3, or:
NetPerCup = 0.31
Scale the sample to drill-wide: Example:
4.6 = 0.31x 15, or:
NetFullWidth = 4.6 kg
Scale the sample to a full hectare: Example:
46.0 = 4.60 x 10, or:
NetPerHa = 46.0 kg/ha
Look up the number of meter shaft revolutions per ha:
CalCharRevs
for the current Drive Type, final sprocket and
transmission configuration. Example:
Drive Type 2, 20T and Standard is:
297 cup revolutions per ha.
CalChartRevs = 297
Detemine the cup rate for this seed mix: Example:
0.155 = 46 ÷ 297, or:
WeightPerRev = 0.155 kg
Determine the number of revolutions required for the
target field rate weight metered per shaft revolution: Example:
258.1 = 40
÷ 0.155, or:
TargetRevs = 258
Look up the Drive Type and final sprocket for
TargetRevs Example:
Drive Type: 2
Final Sprocket: 23 T
NetSample GrossWeight ContainerWeight – =
NetPerCup
NetSample
SampledRows
--------------------------------------- =
NetFullWidth NetPerCup 15 ×
=
NetPerHa NetFullWidth 10
×
=
WeightPerRev
NetPerHa
CalChartRevs
--------------------------------------
=
T etRevs arg
T etRate arg
WeightPerRev
------------------------------------------
=