Seed Packet Planning: Germination and Field Establishment Are Separate Assumptions; illustrative quantitative diagram
Define the quantity before calculating
A laboratory germination percentage and field establishment are not automatically the same quantity. The model treats establishment as conditional on a seed having germinated. Choose compatible stage definitions rather than multiplying two figures that already include the same losses.
Use Vegetable Seed Calculator with the units and the basis stated on its form. Check what each input represents before carrying the output into another record.
Read the model explicitly
Seed count = ceiling[target established plants / (germination fraction × conditional establishment fraction) × (1 + reserve fraction)].
The Gardening and crops calculators group sits within Biology calculators. Keep a measured observation distinguishable from a hypothetical input when moving between its tools.
A worked unit check
| Input as labeled on the tool | Illustrative value |
|---|---|
| Target established plants | 100 |
| Germination assumption (%) | 90 |
| Conditional establishment assumption after germination (%) | 80 |
| Extra ordering reserve (%) | 5 |
| Output from the illustrative inputs | Value | Unit |
|---|---|---|
| Seed count under entered assumptions | 146 | seeds |
Record the original input and its unit with this result. Recalculate when the measurement basis changes; changing a unit label after calculation does not convert the quantity. More decimal places do not remove sampling or measurement uncertainty.
A related quantity
Seed Calculator addresses a related part of the task. Check its own input definition before carrying a number across.
Continue with From Target Plants to Seed Count: Avoid Counting the Same Loss Twice for the other part of this measurement question.
Return to GreenCalc for other subjects. Keep raw observations, chosen assumptions and calculated quantities identifiable so a later revision does not overwrite the basis of the original record.
By GreenCalc · Updated 2026-11-06