| Code | Definition | Number of Accessions |
| 1 | very low < 95,0 (g.kg-1) | 9 |
| 2 | very low to low 95,0 - 103,0 (g.kg-1) | 6 |
| 3 | low 103,1 - 111,0 (g.kg-1) | 6 |
| 4 | low to intermediate 111,1 - 119,0 (g.kg-1) | 10 |
| 5 | intermediate 119,1 - 127,0 (g.kg-1) | 7 |
| 7 | high 135,1 - 143,0 (g.kg-1) | 2 |
| 9 | very high > 151,0 (g.kg-1) | 1 |