Great Plains 1006NT Material Rate - Manual (Page 24)

Great Plains Mfg., Inc.
22
150-287B 04/20/2007
Calibration Formulas and Sample Calibration
Factors which will affect seeding rates are: weight of
seed, size of seed, relative humidity and moisture con-
tent of the seed, ratio of inert material to seed, different
proportions of seed types affecting density, tire config-
uration, tire pressure, and tire slippage.
All seed mixes will vary.
The rates are based on 9.00 x 24 8-Ply tires.
Formulas Example
Know your Desired seed rate in pounds per acre For this example, a target value of:
32 PoundsPerAcre
Weigh the empty sample container(s) For this example, three 1.5# buckets:
4.5 pounds
Operate crank/gauge wheel for one acre For this example, a model 1006NT:
411 revolutions
Weigh the collected seed plus container(s) In this example:
9.5 pounds
Calculate the sampled rate at each seed cup. Assuming 3 cups sampled.
Calculate the sampled rate for all rows working: For this example, a 15-row 1006NT:
Note the current Drive Type and sprocket setting. For this example:
Drive Type 1
Sprocket: 24T
In the chart on page 23, find the Cup Revolutions Per Acre for the
tested configuration. The table cell at Drive Type 1 / 24T is:
50.02 (CupRevolutionsPerAcre)
Calculate the Sampled pounds per cup revolution This is essentially a correction factor:
Calculate the Target cup revolutions per acre Our Target Cup Rate:
In the chart on page 23, find the table cell with the value closest to the
Target. Use the Drive Type and Sprocket shown for that cell. The drive configuration for that target:
Cell: 63.19
Drive Type: 1
Sprocket: 19
MeasuredSeed WeightOfEmptyContainer –
3
---------------------------------------------------------------------------------------------------------- SampledPoundsPerSeedCup =
9.5 4.5 –
3
-------------------- 1.66 PoundsPerSeedCup ( )
=
PoundsPerSeedCup NumberOfOpeners × SampledPoundsPerAcre =
1.66 15 × 24.9 PoundsPerAcre ) ( )
=
SampledPoundsPerAcre
CupRevolutionsPerAcre
-----------------------------------------------------------
SampledPoundsPerCupRevolution =
24.9
50.02
------------ 0.498 PoundsPerCupRev ( )
=
DesiredSeedRate
SampledPoundsPerCupRevolution
------------------------------------------------------------------------------------- T etCupRevolutionsPerAcre arg
=
32
0.498
------------ 64.28 CupRevsPerAcre ( )
=