Cereal Growth Stages
| Decimal Code | Growth Stage |
|---|---|
| Seedling | |
| 10 | First leaf through coleoptile |
| 11 | First Leaf unfolded |
| 13 | 3 leaves unfolded |
| 15 | 5 Leaves unfolded |
| Tillering | |
| 21 | Main shoot and 1 Tiller |
| 23 | Main shoot and 3 Tillers |
| 25 | Main shoot and 5 Tillers |
| 27 | Main shoot and 7 Tillers |
| 29 | Main shoot and 9 or more Tillers |
| Stem elongation | |
| 30 | Ear at 1 cm (pseudostem erect) |
| 31 | 1st node detectable |
| 32 | 2nd node detectable |
| 33 | 3rd node detectable |
| 37 | Tip of flag leaf visible |
| 39 | Flag leaf blade all visible |
| Booting | |
| 41 | Flag leaf sheath extending |
| 43 | Flag leaf sheath just visibly swollen |
| 45 | Flag leaf sheath swollen |
| 47 | Flag leaf sheath opening |
| Ear emergence | |
| 51 | 1st spikelet of ear just visible |
| 55 | Half of ear emerged |
| 59 | Ear completely emerged |
| Flowering | |
| 61 | Start of flowering |
| 65 | Flowering half-way |
| 69 | Flowering complete |
| Milk Development | |
| 71 | Grain watery ripe |
| 73 | Early milk |
| 75 | Medium milk |
| 77 | Late milk |
| Dough Development | |
| 83 | Early dough |
| 85 | Soft dough |
| 87 | Hard dough |
| Ripening | |
| 91 | Grain hard (difficult to divide with thumbnail) |
| 92 | Grain hard (not dented by thumbnail) |
| 93 | Grain loosening in daytime |
From Zadoks, J. C., Chang, T. T. and Konzak, F. C. (1974) A decimal code for the growth stages of cereals. Weed Research 14, 415-421