| Code | Definition | Number of Accessions |
| 1 | very low < 95,0 (g.kg-1) | 6 |
| 2 | very low to low 95,0 - 110,0 (g.kg-1) | 1 |
| 3 | low 110,1 - 125,0 (g.kg-1) | 1 |
| 4 | low to intermediate 125,1 - 140,0 (g.kg-1) | 6 |
| 5 | intermediate 140,1 - 155,0 (g.kg-1) | 9 |
| 6 | intermediate to high 155,1 - 170,0 (g.kg-1) | 10 |
| 7 | high 170,1 - 185,0 (g.kg-1) | 4 |
| 8 | high to very high 185,1 - 200,0 (g.kg-1) | 8 |
| 9 | very high > 200,0 (g.kg-1) | 8 |