Kaolin particle film (0%, 3% and 6%; w/v), as an antitranspirant treatment, was applied to mature ‘Zard’
olive trees (Olea europaea L.). Olive oil was extracted from harvested fruit and fatty acid composition
and other oil quality indices of the fruit assessed over crop seasons. Kaolin increased chlorophyll and
carotenoid contents, but decreased peroxide and iodine values, and UV absorbance extinction coeffi-
cients, of the oil. The highest palmitic acid was observed in the oil obtained from untreated trees
(17%). Kaolin increased oleic acid up to 65% and 64% in the first and second crop seasons, respectively,
but decreased linoleic and linolenic acid contents. Monounsaturated acids (65%) and oleic acid/linoleic
acid ratios (4) were higher in oil obtained from kaolin treated than untreated trees. Therefore it can be
expected that extracted olive oil from kaolin treated trees has a higher oxidative stability and shelf life
than untreated trees