First heading
(Wild species). Date on which the first flush of flowers is observed. It is specified either as the number of days from effective seeding date to first heading date (7.2.2.1) or as the date of effective seeding and date of first heading (7.2.1 and 7.2.2.2).
| Code | Term | Description |
|---|---|---|
| 7.2.2.1 | Number of days from effective seeding to first heading [d] | |
| 7.2.2.2 | First heading date [YYYYMMDD] |