Olive mill wastewater irrigation of maize: Impacts on soil and groundwaterOlive mill wastewater irrigation of maize: Impacts on soil and groundwater Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-142011enThe environmental impact of irrigating a maize field with weathered olive mill wastewater (OMW) for 5 years was assessed. The use of the weathered OMW added the following concentrations of nutrients to the field: 11.8 t/ha/yr carbon, 1033 kg/ha/yr total nitrogen, 23.8 kg/ha/yr phosphorous and 4161 kg/ha/yr potassium. The maize field received 6 times more nitrogen, 50 times more potassium and 2 times less phosphorous than the recommended fertilization rates. The presence of carbon increased microbial activity for organic nitrogen breakdown and the decomposition rate of organic nitrogen. No significant increase was observed of heavy metal accumulation in the soil. Electrical conductivity in the soil remained below the salinization threshold. No direct exposure values were exceeded. No impact on groundwater quality was observed. Irrigation of crops like maize with weathered OMW could be part of a viable decentralized solution for olive mill wastewater use in areas with low organic matter and high irrigation demand.Δημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/Agricultural Water Management7981125–1132 D. Moraetis Stamati Foteini Σταματη Φωτεινη Nikolaidis Nikolaos Νικολαιδης Νικολαος Kalogerakis Nikos Καλογερακης Νικος Elsevier Marginal water Non-conventional fertilization Environmental impacts Water scarcity