| Code | Definition | Number of Accessions |
| 1 | very low <45,0 (g.kg-1) | 4 |
| 2 | very low to low 45,0-55,0 (g.kg-1) | 9 |
| 3 | low 55,1-65,0 (g.kg-1) | 9 |
| 4 | low to medium 65,1-75,0 (g.kg-1) | 1 |
| 5 | medium 75,1-85,0 (g.kg-1) | 2 |
| 6 | medium to high 85,1-95,0 (g.kg-1) | 2 |
| 7 | high 95,1-105,0 (g.kg-1) | 1 |