This research work, carried out by 5th year high school students, studies the effect of irrigation water of different salinity (rainwater, drinking water and saline solutions of 1.2, 2.1 and 2.8 g/L of sodium chloride) on the growth and germination of salinity-sensitive species under laboratory conditions. Three salinity-sensitive species were used: lettuce, corn and spinach. Germination tests were carried out in trays with paper for each of them and a seedling growth test in pots with lettuce. Conductivity was measured and chlorides in water were determined by the volumetric method.