To evaluate the material, 3 types of tests were installed: (1) screening trials that consisted of 6-tree row plots replicated 6 times, (2) in-depth trials that consisted of 4 replications of 25-tree plots of the most promising species/sources identified in the screening trials, and (3) semioperational trials of 0.4 to 2 hectares that consisted of the most promising species/sources identified in th