Abstract
The objective of this work was to evaluate the influence of irrigation and fertilization with nitrogen and potassium on the sterol and triterpene dialcohol contents in two trials of cv. Arbequina in super-intensive orchards in Madrid and Lleida (Spain), using a completely randomized block design. No significant differences in total sterols between deficit and full irrigation treatments were observed. Under very dry conditions, the sterol levels from fully irrigated trees were higher than from rain-fed treatments and the triterpene dialcohol erythrodiol+ uvaol content was lower in the irrigated treatments in Lleida. In the fertilizer trial with full irrigation, total sterols were higher in the two N treatments compared to the unfertilized one; while erythrodiol + uvaol decreased. The application of K fertilizer had no effect on total sterol or triterpene dialcohol contents. A proper fertilization and irrigation are vital to obtain high quality EVOOs that meet the regulatory range in sterol and erythrodiol + uvaol contents.
Highlights
The objective of this study was to evaluate the influence of different irrigation treatments and the application of nitrogen and potassium on sterol composition and triterpene dialcohols erythrodiol + uvaol content in Arbequina virgin olive oil grown under super-intensive conditions
In Lleida, olives were harvested on October 23rd with a maturity index above 3.5, which was very high for Arbequina and one month ahead of the usual date
The effect of N fertilization on the content and profile of sterols and triterpene dialcohols in extra virgin olive oils was more evident than the effect of irrigation
Summary
SUMMARY: The objective of this work was to evaluate the influence of irrigation and fertilization with nitrogen and potassium on the sterol and triterpene dialcohol contents in two trials of cv. The objective of this study was to evaluate the influence of different irrigation treatments and the application of nitrogen and potassium on sterol composition and triterpene dialcohols erythrodiol + uvaol content in Arbequina virgin olive oil grown under super-intensive conditions
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