The olive tree (Olea europaea L.) is famous for its rich bloom, although only between one and two percent of the flowers are fertilized. In the year 2019 in the village of Šared we analised the effect of the Phylgreen, which is an extract made from Ascophyllum nodosum (a species of sea algae) on the quantity and size of the fruit of the cultivar ‘Istrska belica’. The Phylgreen was applied three times on the trees during the flowering period. Six trees were involved in the experiment, three for each treatment. Before the flowering, we marked thirty branch with a comparable number of inflorescences. After the natural thinning of the fruit, we counted the number of fruit for the first time. The second and the third counting took place on the 5th and 14th of October. During the fruits’ technological maturity, we harvested them and weighed them in a laboratory. The flesh of a fruits had been separated from the olive stones and both were weighed on their own. From the results of the statistical analysis it follows that there was no differences on the average number of inflorescences and flowers per branch. The fruit number and fruit weight of the trees treated with Phylgreen were larger. Furthermore, the average weight of the fruit flesh and the fruit stone of the treated trees was larger as well. The ratio between fruit flesh weight and whole fruit weight was larger in the treated trees ith the biostimulant Phylgreen.
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