Table 4 The description of measurement dates based on BBCH (Biologische Bundesanstalt, Bundessortenamnt and Chemische Industrie) development stages [64, 65]
Measurement term | Plant species | |||||
|---|---|---|---|---|---|---|
Sugar beet | Celery | Strawberry | ||||
BBCH Code | Description | BBCH Code | Description | BBCH Code | Description | |
I | 12 | 2nd true leaf unfolded | 12 | 2nd true leaf unfolded | 12 | 2nd true leaf unfolded |
II | 15 | 5th true leaf unfolded | 14 | 4th true leaf unfolded | 14 | 4th true leaf unfolded |
III | 19 | 9 or more true leaves unfolded | 19 | 9 or more true leaves unfolded | 58 | Early balloon stage: first flowers with petals forming a hollow ball |
IV | 32 | Leaves cover 20% of ground | 42 | 20% of the expected root diameter reached | 65 | Full flowering: 50% of flowers open |
V | 35 | Leaves cover 50% of ground | 45 | 50% of the expected root diameter reached | 85 | First fruits have cultivar-specific colour |