This trial was made up of 15 provenances of A. nilotica and one provenance of each of E. microtheca and A. seyal. The provenances of A. nilotica originated in India, Senegal and Sudan, whereas the provenances of the other species were from Sudan. The trial was established with a spacing of 3 x 3 metres in 1984 and assessed after 10 years in 1994, and different growth parameters were measured and subjected to analyses of variance and multivariate analyses.
The fastest growing provenances (A. nilotica and A. seyal) had increment rates of 0.55 m2 ha-1 y-1, which for A. nilotica corresponded to a dry weight production of 1.5 t ha-1 y-1. E. microtheca had a poor survival. Only in total basal area was there convincing evidence of differences between the provenances of A. nilotica, the largest provenance being from Senegal. There were no clear differences between varieties or groups with similar geographical origin.