| Code | Definition | Number of Accessions |
| 1 | very low spring: <34,0 g winter: <34,0 g | 159 |
| 2 | spring:34,0-36,0 g winter:34,0-37,5 g | 100 |
| 3 | low spring:36,1-38,0 g winter:37,6-41,5 g | 133 |
| 4 | spring:38,1-40,0 g winter:41,6-45,5 g | 145 |
| 5 | medium spring:40,1-42,0 g winter:45,6-49,5 g | 232 |
| 6 | spring:42,1-45,0 g winter:49,6-53,5 g | 440 |
| 7 | high spring:45,1-48,0 g winter:53,6-57,5 g | 459 |
| 8 | spring:48,1-50,0 g winter:57,6-61,0 g | 182 |
| 9 | very high spring: >50,0 g winter: >61,0 g | 200 |