| Code | Definition | Number of Accessions |
| 1 | very low <20,0 (g.kg-1) | 2 |
| 2 | very low to low 20,0-25,0 (g.kg-1) | 5 |
| 3 | low 25,1-30,0 (g.kg-1) | 6 |
| 4 | low to medium 30,1-35,0 (g.kg-1) | 5 |
| 5 | medium 35,1-40,0 (g.kg-1) | 5 |
| 6 | medium to high 40,1-45,0 (g.kg-1) | 1 |
| 7 | high 45,1-50,0 (g.kg-1) | 1 |
| 8 | high to very high >50,0 (g.kg-1) | 2 |