| Variable location | Experimental sites | ||
| Gia Lai | Dak Lak | Dong Nai | |
| District | Ia Grai | Buon Ma Thuot | Trang Bom |
| Altitude (m asl) | 750 | 650 | 15 |
| Live support types | Leucaena leacocephala | Casia siamea | Wrightia annamensis |
| Soil types | Bazan | Bazan | Bazan |
| Average temperature (˚C) | 22.6 | 24.2 | 26.8 |
| Annual rainfall (mm) | 2329.3 | 1630.6 | 2158.9 |
| Dry months | 6 | 6 | 6 |
| Relative humidity % | 81.5 | 81.0 | 80.5 |