This trial was made up of nine provenances of Prosopis. There was one provenance of each of the species P. affinis, P. alba var. panta, P. flexuosa, P. glandulosa, P. kuntsei, P. nigra, P. pallida and two of P. juliflora. The trial was established in 1988 at a spacing of 2.5 x 3 metres and assessed after 5 years in 1992.
The fastest growing provenance had an increment rate in basal area of 0.65 m2 ha-1 y-1, corresponding to a dry weight production of approximately 1.7 t ha-1 y-1. Survival in the trial was high for most provenances. The provenances with the fastest growth in basal area were of P. affinis, P. juliflora and P. pallida, whereas provenances of P. alba and P. glandulosa were intermediate. Provenances/species with slow growth were of P. flexuosa, P. kuntsei and P. nigra. The differences between the provenances were highly significant for most of the analysed variables.