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Abiotic stress factors (rainfall patterns, altitude, soil type, and soil pH) of the plant collection sites of the four provinces.
| Location | Rainfall (annual average, mm) | Altitude (m) | Soil type | Soil pH |
|---|---|---|---|---|
| Limpopo | 389 | 1329 m | Loam | 5.17 |
| Mpumalanga | 490 | 1020 m | Loam | 6.32 |
| Gauteng | 519 | 1246 m | Loam | 5.98 |
| North-West | 540 | 1083 m | Clay | 6.80 |
