| Code | Definition | Number of Accessions |
| 1 | very low < 150,0 (g.kg-1) | 6 |
| 2 | very low to low 150,0 - 165,0 (g.kg-1) | 2 |
| 3 | low 165,1 - 180,0 (g.kg-1) | 2 |
| 4 | low to intermediate 180,1 - 195,0 (g.kg-1) | 6 |
| 5 | intermediate 195,1 - 210,0 (g.kg-1) | 7 |
| 6 | intermediate to high 210,1 - 225,0 (g.kg-1) | 10 |
| 7 | high 225,1 - 240,0 (g.kg-1) | 12 |
| 8 | high to very high 240,1 - 255,0 (g.kg-1) | 3 |
| 9 | very high > 255,0 (g.kg-1) | 16 |