This work is aimed to test the response of a courgette variety, irrigated by treated wastewater of 3dS/m, cultured by the soilless technique (sand, coconut fiber) and compared in the field and in the greenhouse. The objective is to determine the water and mineral balance, as well as the impact of the two substrates on the growth and production potentials under the effect of treated wastewater. The water consumption in the field exceeds 34% and 39.3% respectively for sand and coconut fiber. The total yield is respectively 38.7; 35.4; 32.4 t/ha for sand; field and coconut fiber. The maximum chlorine concentration on sand has been lower than 1 meq/l whereas in the field it reached 7.1 meq/l. The profitability rate is respectively 49.4%; 34.9%; 0% for sand; field and coconut fiber.
