Great Plains 606NT Material Rate - Manual (Page 45)

Great Plains Manufacturing, Inc. Table of Contents Main Box Rates Appendix 43
2011-10-21 Table of Contents Main Box Rates 151-122B
Metric Native Grass Rates
For U.S. customary units, see page 26.
Formulas Metric Example
Know your Desired seed rate in pounds per acre:
TargetRate Example target seed rate:
62 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:
4
As there is only minor benefit in changing the final drive
sprocket for calibration, we leave it as is. Example final drive sprocket:
18T
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 For this example, a model 606NT:
246 revolutions (
1 ⁄
10
th
of 2459)
Weigh the collected seed plus container(s):
GrossWeight Example:
GrossWeight = 6.27
Obtain the net sample weight: Example:
6.27 - 2.04, or:
NetSample = 4.23
Determine the net sample weight per cup: Example:
4.23
÷ 3, or:
NetPerCup = 1.41
Scale the sample to drill-wide: Example:
1.41 x 9, or:
NetFullWidth = 12.69 pounds
Scale the sample to a full hectare: Example:
12.69 x 10, or:
NetPerAcre = 126.9
Look up the number of meter shaft revolutions per ha:
CalCharRevs
for the current Drive Type, final sprocket and
transmission configuration. Example:
DT4, 18T and Standard is:
1326 revolutions per ha.
CalChartRevs = 1326
Detemine the cup rate for this seed mix: Example:
126.9 ÷ 1326, or:
WeightPerRev = 0.096
Determine the number of revolutions required for the
target field rate weight metered per shaft revolution: Example:
55
÷ 0.210, or:
TargetRevs = 648
Look up the Drive Type and final sprocket for
TargetRevs Example:
Drive Type: 2
Final Sprocket: 15 T
NetSample GrossWeight ContainerWeight – =
NetPerCup
NetSample
SampledRows
---------------------------------------
=
NetFullWidth NetPerCup 9 ×
=
NetPerHa NetFullWidth 10 × =
WeightPerRev
NetPerHa
CalChartRevs
--------------------------------------
=
TargetRevs
TargetRate
WeightPerRev
-------------------------------------------
=