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Average age of varieties in farmers’ fields for several crops and countries.
| Crop | Country | Average age of variety (years) | Weighting basis | Year of estimate | Source |
|---|---|---|---|---|---|
| Hybrid maize | US | 3 | Area | 2016 | Brooks (2009) |
| Hybrid maize | Kenya | 17 | Area | 2010 | Smale and Olawande (2014) |
| Rainfed rice | India | 28 | Area | 2014 | IRRI, unpublished data |
| Wheat | India | 13 | Seed production | 2008 | Krishna et al. (2014) |
