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The effects of the treated municipal wastewater (TMWW) on the essential nutrients interactions in the various plant parts of Brassica oleracea var. Italica (Broccoli) was studies, in comparison to the fresh irrigation water, denoted as "control". The experiment was based on a randomized block design, and it was conducted in a greenhouse of the Department of Environmental and Natural Resources Management, University of Ioannina, Agrinion, Greece. It included two treatments, i.e. (a) TMWW and (b) control, in six replications, with a total number of 2×=12 plots of 2.5 m×1.8=4.5 m² size. The plants were transplanted in rows 0.8 m apart from each other, while the distance between the plants in the row was 0.5 m. During the growth period, thirteen applications of TMWW and control, respectively, were made, each one being equal to 30 L/4.5 m². In total 390 L/4.5 m² or 867 m³/ha were applied. The following were found …