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Comparative analysis of case studies: environmental conditions.
| Factor | Inland pacific northwest | Semi-arid southern Australia |
| Annual rainfall | Low rainfall zone: <300 mm Intermediate RZ: 300–450 mm High RZ: 450–600 mm | 280–400 mm |
| Growing season length | Winter wheat: 11 months (September–July) Spring wheat: 6 months (April–August) | Winter wheat: 8 months (April–November) Spring wheat: 7 months (May–November) |
| Optimal flowering period | Late spring (May) | Early spring (September) |
