Influence of foliar nutrition with nitrogen, potassium and boron on the level and seasonal changes of nitrogen, potassium and boron concentrations in the olive leaves cv. Oblica

Istraživan je utjecaj folijarne primjene dušika, kalija i bora na razinu i dinamiku koncentracije dušika, kalija i bora u listu masline sorte Oblica. Koncentracija dušika u lišću je bila najveća u zimsko-proljetnom razdoblju, a najniža sredinom vegetacije u vrijeme otvrdnjavanja koštice ploda. Koncentracija kalija u lišću se povećavala postupno do razdoblja dozrijevanja plodova. Koncentracija bora u lišću masline nije očitovala pravilnost promjena tijekom vegetacijske sezone. Folijarna primjena N, K i B očitovala se značajnim povećanjem koncentracija dušika, kalija i bora u lišću masline.Influence of foliar nutrition with nitrogen, potassium and boron in comparison with untreated control trees on the level and seasonal changes of nitrogen, potassium and boron in the olive leaves cv. Oblica were observed over the growing season. The concentration of N in the leaf was the highest in the winter-springtime period, while the lowest N concentration was observed in the middle of the vegetation when stone in the fruit was hardening. Leaf potassium concentration gradually rose up to time of fruit ripening. Boron concentration showed no clear seasonal tendency. Foliar application of N, K and B caused significantly higher leaf N,K and B concentration