“…Table 1 shows that wastewater used in this study contained about 3.86 mg L −1 of ammonia (or 3 mg NH 4 -N L −1 ) and 18. The wastewater used in our study did not contain detectable amounts of P; however, other studies have reported that wastewater irrigation increased N, P, and K contents in the soil by 40, 43, and 82 kg ha −1 yr −1 , respectively (Nakib, Kettab, Berreksi, Tebbal, & Bouanani, 2016;Rodrigues dos Santos et al, 2015). Results from our study should alleviate any concern of excess N addition by wastewater irrigation (Sophocleous, Townsend, Vocasek, Ma, & Ashok, 2009 (Figure 3a-c).…”