Effects of nitrogen fertilization and nitrification inhibitor product on vegetative growth, production and oil quality in ‘Arbequina’ hedgerow and ‘Picual’ vase-trained orchards
DOI:
https://doi.org/10.3989/gya.0441171Keywords:
Leaf analysis, Oil quality, Olea europaea L., Olive fertilization, Phenolic compounds, Reproductive componentsAbstract
Two experiments were carried out in olive orchards in the center of Spain over a three-year period. In this cold and dry area, growers traditionally apply large amounts of N with no experimental knowledge. An ‘Arbequina’ hedgerow and ‘Picual’ vase orchards were fertilized with two N-doses applied to the soil in spring with or without the nitrification inhibitor (DMPP). Vegetative growth, fruit and oil characteristics were evaluated. These variables were affected by the N-treatment during the 3rd year. The lowest N-application increased vegetative growth, while when N-leaf composition was higher than 2%, fruit dry weight, oil content and oil phenol content were reduced. ‘Picual’ did not respond to N-applications. The effect of DMPP on growth or production was not consistent and a lower phenolic content was obtained for ‘Arbequina’. Our results demonstrated that in this dry land, N-fertilization is not always necessary and oil quality can be negatively affected with high doses.
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