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In this study, their effects on volatile oil composition, phenolics, and antioxidant activity of <jats:italic>Achillea gypsicola<\/jats:italic> were investigated. Treatments included control (water\u00a0+\u00a0ethanol), 0.5\u2010, 2\u2010, and 8\u2010mM SA, and 2, 4, and 8\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup> CH. The process is completely randomized with four replications, with two harvests between 2021 and 2022. As a result, 4\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup> CH significantly increased 1,8\u2010cineole and borneol production. The highest total phenolic content (TPC) and total flavonoid (TFC) were obtained from the 8\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup> CH treatment. LC\u2013MS\/MS analysis revealed a 2\u2010fold increase in chlorogenic acid, 1.01\u2010fold increase in gallic acid, and 0.56\u2010fold increase in protocatechuic acid from 4 and 8\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup> CH treatments. Strong positive correlations were found between DPPH radical scavenging assay and iron ions chelating assay (0.803**), TFC (0.556**), and TPC (0.562**).<\/jats:p>","DOI":"10.1002\/cbdv.202402716","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T11:47:27Z","timestamp":1741693647000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Salicylic Acid and Chitosan Elicitors: Pre\u2010Harvest Foliar Applications Improve Antioxidant Activity by Increasing Phenolic Compounds in <i>Achillea gypsicola<\/i> Hub\u2010Mor"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2436-5605","authenticated-orcid":false,"given":"Muhammed","family":"Akif A\u00e7\u0131kg\u00f6z","sequence":"first","affiliation":[{"name":"Department of Field Crops, Faculty of Agriculture Ordu University  Ordu 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