Effects of the application of wastevater from olive processing on soil nitrogen transformation

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Abstract
An incubation experiment was performed to study the effects of wastewater from olive processing on nitrogen transformation in a calcareous soil. The application of this wastewater was shown to decrease NO3 ‐ formation in comparison with control assays during approximately the first half of the experimental period (6 weeks). Results were similar although more marked when vegetation water plus ammoniacal nitrogen was applied as opposed to ammoniacal nitrogen alone. The incorporation of vegetation water during the initial phases of study also reduced soil N‐NH4 + levels both when residue only treatments were compared with controls and when vegetation water plus ammoniacal nitrogen treatments were compared with ammoniacal nitrogen only.