Summer squash-Early Yellow Crookneck (Ctrburblta pepo) and Cantaloupe (Cucumis meld) were grown in the same concrete lysimeters. This study tested the ability of the two vegetation indices; normalized difference vegetation index and simple ratio vegetation index on the detection ol‘ water and salinity stress. Also. it assessed the capability of a new salinity stress index of recognizing salinity stress. Results showed that the salinity stress index indicated clear separation between the treatments for most of the data days: h“waver, differences were not statistically significant. it appears that it was a more appropriate index for cantaloupe than for summer squash. Both vegetation indices separated between salinity treatments at most of the data days (60%) for both summer squash and cantaloupe. They clearly separated between water treatments in about 40-50% of the data days. it appears that their ability in showing water stress was not as theirs in showing the salinity stress. Simple ratio stress index was better than the normalized difference vegetation index in separating between salinity treatments because it gave clear separation between treatments in about art-rose of the data days. its capability of showing water stress was not as good as its in assessing salinity stress.