Optimisation of the use of nitrogen in the treated wastewater reused for irrigation

Application of recycled water to agricultural land for irrigation could be an alternative water resource for Mediterranean countries facing severe water shortage. Rational use of the nutrients in recycled water could increase crop production and reduce environmental pollution. This study was designed to investigate the effect of treated wastewater and N applied on the yield of three field crops. Three experiments with green pepper, eggplants and sudax, irrigated with borehole water or with secondary treated municipal wastewater, were carried out in a field experiment. Both waters were supplemented with N applied continuously with the irrigation water at four levels 0 g/m³, 50 g/m³, 100 g/m³ and 150 g/m³. Yield results indicate the superiority of the treated wastewater and its ability to produce high yields with less N fertilizers.