The Dolenjska region in Slovenia is known as a land of many wooden rural buildings. The open-air museum Dežela kozolcev (Land of Hayracks) in the village of Šentrupert was established to preserve this unique cultural heritage. We selected four hayracks from the museum and performed dendrochronological analyses to determine the years of formation of the outermost rings, as well as the age and possible renewals of objects. Wood samples for research were taken in 2012 by the research team of the Department of Wood Science and Technology, before the hayracks were moved to the museum. The samples were processed in the laboratory, and the width of the annual tree-rings was measured using the TSAP Win programme. The tree-ring series were crossdated to establish chronologies of the objects, which were finally dated with reference chronologies of oak from Slovenia. The wood taken mostly from hayrack pillars was in all cases oak (Quercus sp.). The wood used for the pillars of the Zatler's hayrack, which was previously located in the village of Rakovnik, was dated to 1878. The year 1878 is also recorded as the year of the hayrack construction in the documents of the Zatler family. The Lap's hayrack was dated to 1910. The Božič's hayrack, which was originally located at the homestead in the village of Prelesje, was dated to 1956. The Pluskar's hayrack has got pillars from several periods. Two of them were made of timber cut after 1854, which presumably indicates the construction of the original hayrack. One pillar dates to 1909, which indicates that it has been replaced during a reconstruction or reparation stage that has not been recorded. The end date 1954 on two other pillars however points to the renovation in 1956, which has also been recorded in the documents of the Dežela kozolcev open-air museum.
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