Olive (Olea europaea L.) tree nitrogen status is a key factor for olive oil quality.

J Agric Food Chem

Institute of Soil, Water and Environmental Sciences and ‡Institute of Plant Sciences, Gilat Research Center, Agricultural Research Organization , Mobile Post Negev 2, 85280, Israel.

Published: November 2013

AI Article Synopsis

  • The study examined how the availability of macronutrients (N, P, K) influences olive oil quality over three years.
  • Nitrogen (N) concentration was found to be the primary factor affecting oil quality, with higher N levels benefiting the oil's polyunsaturated fatty acid content and free fatty acids.
  • Phosphorus (P) mainly impacted oil quality indirectly by enhancing N accumulation, while potassium (K) had little effect; additionally, high fruit load negatively affected fruit N levels while improving oil quality.

Article Abstract

The influence of macronutrient status on olive oil properties was studied for three years. Data were analyzed by a multivariate model considering N, P, K, and fruiting year as explanatory factors. Oil quality parameters were primarily associated with N concentration in leaves and fruits which increased with N in irrigation solution. The effect of P on oil quality was mainly indirect since increased P availability increased N accumulation. The potassium level had negligible effects. The oil phenolic content decreased linearly as a function of increased leaf N, indicating protein-phenol competition in leaves. The overall saturation level of the fatty acids decreased with fruit N, resulting in increased polyunsaturated fatty acids. Free fatty acids increased with increased levels of fruit N. High fruit load tended to reduce fruit N and subsequently improve oil quality. The effect of N on oil properties depended solely on its concentration in leaves or fruits, regardless of the cause.

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Source
http://dx.doi.org/10.1021/jf4031585DOI Listing

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