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ŠUMARSKI LIST 11-12/2023 str. 15     <-- 15 -->        PDF

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Abstract
Holm oak forests in Croatia are in various stages of degradation, and one of them is maquis, which is a less favorable stage for the germination of holm oak seeds compared to holm oak stumps or stands of high growth form. Holm oak is a xerophytic species of forest trees. From the geological base, it comes from limestone, which is the most common in our Mediterranean area, and dolomite. Begins to flower in the eighth year of life, and the seed harvest begins at the age of 12 to 15 years, and the full harvest is every 4 to 6 years. The holm oak acorn crop is variable, where three abundant acorn crops were recorded in the eight-year period. The full harvest of holm oak depends on climatic conditions, but it also differs significantly between different habitats, especially the geological base and soil type. For laboratory analyses, holm oak acorns were collected in the area of G.J. “Kamenjak” on the island of Rab. The aforementioned G.J. managed by “Hrvatske šume d.o.o.” The seeds were collected in department unit 15a, 16a, 26a and 27a in the period from 01/12/2020 to 10/01/2021. The collection was carried out using the method of shaking acorns from the trees onto mats placed under the canopy and the method of collecting fallen acorns from the ground. Assessment of seed vitality using the tetrazole method and laboratory germination was made according to the ISTA rules for holm oak. The percentage of laboratory germination was determined according to the percentage of normal seedlings that germinated normally after the 35th day of testing. The total vitality of holm oak acorns was high and amounted to 90.25 %, while the rest of 9.75 % consisted of non-vital seeds. Of the vital seeds, the largest percentage (79.50 %) consists of seeds with fully colored embryo and cotyledons. Acorns with cotyledons that has necrosis up to 1/3 on the distal part and are not connected to the embryonic cavity