Examples
Examples
Try the starting example
- Seed collected from all outlets (g)
- 1000
- Test drive-wheel revolutions
- 50
- Effective wheel circumference (m)
- 2
- Active drill width (m)
- 2.5
- Chosen target rate (kg/ha)
- 50
- Equivalent travel (m)
- 100
- Equivalent test area (m²)
- 250
- Observed seed rate (kg/ha)
- 40
- Target-to-observed rate ratio
- 1.25
Try another scenario
- Seed collected from all outlets (g)
- 500
- Test drive-wheel revolutions
- 100
- Effective wheel circumference (m)
- 2
- Active drill width (m)
- 2
- Chosen target rate (kg/ha)
- 25
- Equivalent travel (m)
- 200
- Equivalent test area (m²)
- 400
- Observed seed rate (kg/ha)
- 12.5
- Target-to-observed rate ratio
- 2
Calculation method
Calculation method
Equivalent travel (m)
Wheel revolutions × measured effective circumference.
Equivalent test area (m²)
Equivalent travel × active drill width.
Observed seed rate (kg/ha)
Collected grams / 1000 × 10,000 / test area.
Target-to-observed rate ratio
Target kg/ha / observed kg/ha.
Symbols and units
- a
- Seed collected from all outlets (g)
- b
- Test drive-wheel revolutions
- c
- Effective wheel circumference (m)
- d
- Active drill width (m)
- e
- Chosen target rate (kg/ha)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Measured all-outlet catch test with an effective drive-wheel circumference. The ratio compares rates, not a universally valid dial adjustment. Wheel slip and metering behaviour require a retest under the manufacturer’s procedure.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
University of Minnesota Extension: planting equipment calibration ↗
Background reading; this does not imply endorsement or independent review of SumFizz.