Influence of irrigation on fertility, oil rand and fruit growth dynamics of three olive cultivars on collection in Poreč

Praktični pokazatelji uzgoja maslina u Istri u zadnjih 20-tak godina pokazuju značajne gubitke uroda uzrokovanih jačom sušom u fazi rasta i razvoja ploda. Uz primjenu navodnjavanja postižu se pozitivni rezultati u očuvanju priroda, krupnoće ploda i randmana ulja što značajno ovisi i o sorti. Sami smo svjedoci sve učestalijih suša, pa je i otpornu i izdržljivu maslinu potrebno navodnjavati da bi dala kvalitetan plod. Cilj rada je utvrditi da li navodnjavanje značajno utječe na rodnost, postotak ulja u plodu i dinamiku rasta na području grada Poreča. Istraživanje je provedeno na tri sorte 'Ascolana Tenera', 'Leccino' i 'Leccio del Corno' s dva tretmana: navodnjavano i bez primjene navodnjavanja (kontrola) u tri repeticije. Uzorkovanje se obavljalo osam puta tijekom rasta i razvoja ploda, odnosno od 14. srpnja do 7. listopada u 2016.-oj godini. Rezultati dobiveni mjerenjima pokazuju da navodnjavanje nije ključno da bi rodnost, randman i dinamika rasta ploda bila bolja. Kod sorte 'Leccino' su se pokazali zadovoljavajući rezultati primjenom navodnjavanja. Zatim, sorta 'Leccio del Corno' je također dala dobre rezultate, a 'Ascolana Tenera' je dala bolje rezultate pri nenavodnjavanim uvjetima uzgoja. Iz dobivenih rezultata zaključujemo da je navodnjavanje potrebno samo kod nekih sorti, ali treba uzeti u obzir količinu oborina, vrstu tla i mnoge druge čimbenike.Practical indicators of olive growing in Istria in the last 20 years show significant losses of yield caused by stronger drought in the growth and development of fruit. With the application of irrigation, positive results of conservation of nature, fruit size and aroma of oil depend on the variety. We are witnessing more and more frequent droughts, so the resistant and durable olives need to be irrigated to produce quality fruit. The aim of this thesis is to determine whether irrigation has a significant impact on fertility, the percentage of fruit oil and the growth rate in the Poreč area. Three varieties of 'Ascolana Tenera', 'Leccino' and 'Leccio del Corno' have been investigated in two treatments: irrigated and without application of irrigation (control) in three repetitions. Sampling was performed eight times during the growth and development of fruit, from July 14 to October 7, 2016. The results obtained by measurements show that irrigation is not essential in order to improve fertility, oil percentage and dynamics of fruit growth. In the case of 'Leccino' variety, satisfactory results have been demonstrated by irrigation. Then, the variety 'Leccio del Corno' has also produced good results, and 'Ascolana Tenera' has yielded better results in the unconventional conditions of breeding. From the obtained results we conclude that irrigation is only necessary in some varieties, but the amount of precipitation, soil type and many other factors should be considered