This trial was made up of 13 provenances of Prosopis. The species were P. alba, P. chilensis, P. flexuosa, P. glandulosa, P. juliflora, P. nigra and P. pallida, represented with two provenances each except for P. nigra with only one. The trial was established with a spacing of 6 x 6 metres and assessed after 5 years in 1992. The fastest growing provenances had an increment rate in basal area of 0.5 m2 ha-1 y-1, corresponding to a dry weight production of approximately 2.1 t ha-1 y-1.
The provenances with the fastest growth in basal area were of P. juliflora and P. pallida, whereas provenances of P. chilensis, P. flexuosa, P. glandulosa and P. nigra had slower growth. P. alba was intermediate. The differences between provenances were highly significant, but species differences were less conspicuous. There was evidence of differences between the provenances within P. juliflora, P. flexuosa and P. alba.