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Nitrogen recycling across a spectrum of fertilization strategies: an assessment in olive groves

dc.contributor.authorDomouso, Pablo
dc.contributor.authorCalero, Julio
dc.contributor.authorRuiz-Cátedra, Gustavo
dc.contributor.authorGarcía-Ruiz, Roberto
dc.date.accessioned2025-01-19T22:30:53Z
dc.date.available2025-01-19T22:30:53Z
dc.date.issued2024-09-15
dc.description.abstractUnder the Zero pollution action, there is a strong emphasis on promoting management practices that enhance nitrogen (N) cycling to decrease reliance on inorganic N fertilizers and mitigate potential environmental impacts. Olive (Olea europaea L.) groves constitute the dominant landscape of many areas of Southern Mediterranean as Andalusia (Spain). Different farming models coexist in the olive sector, but they had not been studied in the context of N cycle. By integrating field and model data, we analyzed N flows, N balance, levels of N cycling closure, and N footprints in olive groves employing various cultivation models. Farms were categorized on: Org (organic external fertilization, high level of biomass recycling, temporary spontaneous cover crops), Tra (organic external fertilization, low recycling, bare soil), Int (inorganic external fertilization, low recycling, bare soil) and IPr (inorganic or organic external fertilization, low recycling, temporary spontaneous cover crops). Tree N demand, averaging 55 kg ha-1 y-1, correlated with fruit production and canopy area, making them suitable proxies for calculating N demand without exhaustive sampling. The N balance was positive for all farming models, with the Org model showing a more neutral balance (+7.4 kg N ha-1 y-1) and the IPr olive farms showing surpluses (+40.2 kg ha-1 y-1). In Org farms, annual N inputs were the lowest and rely on natural entries like N fixation, while Cycling Index was significantly higher than those of other groups (between 1.45 and 1.81 times). This was attributed to N recirculation mechanisms such as cover crops, shredding tree pruning, and returning harvested N through composted olive mill pomace. Soil erosion, often overlooked, emerged as a major N outflow, especially in Org farms with the highest soil N content, resulting in the highest N losses per liter of oil. Per liter of olive oil, Trad, Ipr, and Int farms use between 1.9 and 2.2 times more anthropogenic N inputs than Org farms. Overall, our results highlight significant potential to enhance internal N cycling, increase self-sufficiency, and extend the lifespan of N in olive farming by implementing scalable management practices that promote nature-based processes.es_ES
dc.description.sponsorshipProject "Novel approaches to promote the SUSTAInability of OLIVE cultivation in the Mediterranean " (SUSTAINOLIVE; sustainolive.eu) funded through PRIMA-EU, Grant nº 1811.es_ES
dc.identifier.citationP. Domouso, J. Calero, G. Ruiz-Cátedra, R. García-Ruiz, 2024. Nitrogen recycling across a spectrum of fertilization strategies: an assessment in olive groves. Agriculture Ecosystems & Environment 372, 109096es_ES
dc.identifier.issn0167-8809es_ES
dc.identifier.other10.1016/j.agee.2024.109096es_ES
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0167880924002147?via%3Dihubes_ES
dc.identifier.urihttps://hdl.handle.net/10953/4169
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofAgriculture, Ecosystems and Environment; 2024; 109096: 1 -12es_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectNitrogen cyclees_ES
dc.subjectNutrient balancees_ES
dc.subjectOlive orchardes_ES
dc.subjectOrganic amendmentes_ES
dc.subject.udc55 Geología y ciencias afines.es_ES
dc.subject.udc63 Agricultura.es_ES
dc.titleNitrogen recycling across a spectrum of fertilization strategies: an assessment in olive groveses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES

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