| Code | Definition | Number of Accessions |
| 1 | very low < 160,0 (g.kg-1) | 27 |
| 2 | very low to low 160,0 - 170,0 (g.kg-1) | 11 |
| 3 | low 170,1 - 180,0 (g.kg-1) | 4 |
| 4 | low to intermediate 180,1 - 190,0 (g.kg-1) | 3 |
| 5 | intermediate 190,1 - 200,0 (g.kg-1) | 3 |
| 6 | intermediate to high 200,1 - 210,0 (g.kg-1) | 4 |
| 7 | high 210,1 - 220,0 (g.kg-1) | 1 |
| 8 | high to very high 220,1 - 230,0 (g.kg-1) | 3 |
| 9 | very high > 230,0 (g.kg-1) | 4 |