Effect of irrigation on qualitative and quantitative traits of olive (Olea europaea var. Coratina) grown on ameliorated karst

Navodnjavanje u uvjetima melioriranog krša, eumediteranske klime je neophodna mjera za održivost dugogodišnjeg maslinika. Istraživanje je provedeno kod mjesta Žman na Dugom otoku, između 18. lipanja 2019. i 17. rujna 2019. god. U svrhu dokazivanja optimalne potrošnje vode korištena su četiri tretmana navodnjavanja: K - kontrola – nenavodnjavana stabla masline, T1 – proizvođačka praksa – proizvođač prema iskustvu određuje obroke i količinu vode, T2 - SAN praksa – obroci i količina vode određena s obzirom na kapacitet tla za vodu, evapotranspiraciju i fenofazu razvoja masline, T3 - dodavanje 100 % vode od izračunate evapotranspiracije s obzirom na maksimalni kapacitet tla za vodu. Nakon odrađene sezone navodnjavanja prikupili su se pojedini parametri stabla masline te uzorci plodova različitim tretmanom navodnjavanja. Rezultati su pokazali da najveći prirast vegetativnih parametara ima tretman s najvećom dodanom količinom vode, a najmanji prirast onaj s najmanjom dodanom količinom vode, dok su rezultati ostala dva tretmana po vrijednostima između ovih. Isti rezultati dobiveni su za masu ploda te udio mezokarpa i koštice u plodu. Analiza ulja pokazala je da je tretman bez navodnjavanja ima kemijski najkvalitetnije parametre ulja ali s druge strane ima najmanji postotak ulja u svježoj tvari te lošiju ocjenu panela. Najbolja ocjena panela pripala je tretmanu T2.Irrigation in the conditions of ameliorated karst, eumediterranean climate is a necessary measure for the sustainability of long-standing olive groves. The research was conducted near Žman on Dugi otok, between June 18, 2019 and September 17, 2019. In order to prove the optimal water consumption, four irrigation treatments were used: K - control - non-irrigation of olive trees, T1 - owner practice - owner determines rations and quantity of water according own experience, T2 - SAN practice - rations and water quantity determined with regard to soil capacity for water, evapotranspiration and the phenophase of olive development, T3 - addition of 100 % water from the calculated evapotranspiration with consideration to the maximum soil water capacity. After the irrigation season, individual parameters of the olive tree and fruit samples were collected with different irrigation treatments. The results showed that the highest increment of vegetative parameters has the treatment with the highest added quantity of water and the lowest increment is the one with the lowest added quantity of water, while the results of the other two treatments are in between. The same results were obtained for the weight of the fruit and the proportion of mesocarp and pit in the fruit. The analysis of the oil showed that the treatment without irrigation has the chemically highest quality oil parameters but on the other hand has the lowest percentage of oil in the fresh matter and a poorer rating of the panel. The highest rating of the panel belonged to the T2 treatment