Climate changes, ever more frequent drought, increase in variation of rainfall and overall progress in agriculture results in an ongoing increase in demand for irrigation water. Most of it comes from drinking groundwater with limited reserves, which can already be a problem in some part and season in our country. Because of that we designed an experiment where we us different treated reusable water sources from municipal wastewater; algae-based technology, plant-based wastewater treatment, and anaerobic wastewater treatment in central wastewater treatment plant in Ajdovščina, where we conducted the experiment. We want to find out if there will be any difference in harvest mass based of test plant Red kuri squash (Cucurbita maxima L.) on different treatment and if there will be any differences in concentration of heavy metals in soil and plants because of different water sources we used. That is one of the steps to prove if we can safely use wastewater in irrigation of agricultural plants for human consumption. Out of ten different heavy metals that we analysed in soils and plants, we only found difference in copper concentrations in plants, but we suspect that the difference comes from the increased availability in soil rather than from irrigation with treated wastewater. We didn`t notice any negative effects on plants health and development.
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