The results showed that RWW can effectively substitute K-chemical fertilizer and can also improve some soil fertility parameters by the end of the growing season. For example, increases in available K and organic matter in the RWW treated cucumber beds were 25–71% and 2–11%, respectively. Similar increases were reported in the case of tomato beds (7–62% and 7–17%). Such increases corresponded to increases in K uptake by cucumber and tomato plants (30 and 37%, respectively). Calcium uptake was also increased to levels as high as 40 and 34% in both crop cases. Results of this study indicated that the application of Raw Waste Water from Food Industry improve cucumber and tomato performance and soil fertility.