Seeds and Propagation
Plug Tray Requirement Calculator
Plug Tray Requirement provides a numerical answer for the task to allow for unusable cells when planning plug production. It does not replace the field checks described below.
Enter values for cells to sow
Keep Plug Tray Requirement units with their measurements.
Preparing the Plug Tray Requirement values
Prepare Seedlings required and Usable cell rate for Plug Tray Requirement. Keep unrelated records separate.
- Seedlings required. The Plug Tray Requirement target is 540 seedlings in the starting case.
- Usable cell rate. Plug Tray Requirement enters 88% for this percentage.
Applying the cells to sow result
Identify the stage being counted: seed, germinated seed, emerged seedling, usable transplant, or established plant. Each stage has a different loss point.
Plug Tray Requirement in practical terms
Allow for unusable cells when planning plug production. Plug Tray Requirement limits that task to Seedlings required and Usable cell rate.
Save Cells to sow with the Plug Tray Requirement units and scenario name.
Worked cells to sow example
The cells to sow ratio uses Seedlings required and Usable cell rate in the order shown.
Seedlings required at 540 seedlings, usable cell rate at 88% produces 614 cells in the demonstration case.
Using the Plug Tray Requirement result
Plug Tray Requirement summarizes its formula as Cells to sow.
Cells to sow: practical constraint
Round trays upward after considering the tray cell count.
A zero Usable cell rate leaves cells to sow undefined in Plug Tray Requirement.
Seedlings required source record
Store the Plug Tray Requirement date, Seedlings required and Usable cell rate, and Cells to sow.
Separate measured seedlings required from an assumed value so a later user can reconstruct the case.
Add the garden outcome as a new entry, using the same units and definition as cells to sow.
Plug Tray Requirement low-and-high comparison
Test Plug Tray Requirement with Seedlings required at 594 seedlings rather than 540 seedlings. The displayed cells to sow becomes 675 cells instead of 614 cells.
The test holds usable cell rate constant. Test expected established plants separately in Seed Packet Plant Count Calculator.
Test a measured range for seedlings required when it may alter the decision.
Questions about Plug Tray Requirement
Should germination and survival be combined in Plug Tray Requirement?
Combine them only when the formula explicitly names both rates; otherwise keep each loss stage separate.
How does “Round trays upward after considering the tray cell count.” affect cells to sow?
Plug Tray Requirement uses the entered numbers only. Let seedlings required reflect that condition before calculating.
How is Usable cell rate entered in Plug Tray Requirement?
Use percentage points for Usable cell rate. For a 25 percent value, type 25.