19 and 10 acacia and eucalyptus exotic species were evaluated throughout 20 years to find out their adaptability to the site which is afflicted by severe drought and salinity. After twenty years, some of the investigated species showed stability in the same degree of adaptability that was found in the previous assessment (i. e. after 5 and 10 years), while a group of the other species revealed a progress in the degree of adaptability to environmental conditions of the site and other species showed a decline in the degree adaptability. The evaluation showed that after twenty years, about half of the acacia species that were grown at the site had 100 percent survival rate while about half of t
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