20.500.12556/RUL-171121 Analysis of olive tree flowering behavior based on thermal requirements a case study from the northern Mediterranean region Abstract In recent years, early olive fruit drop has been observed in the northern Mediterranean regions, causing significant economic losses, although the exact cause remains unknown. Recent studies have identified several possible causes; however, our understanding of how olive trees respond to these environmental stresses remains limited. This study includes an analysis of selected meteorological and flowering data for Olea europaea L. “Istrska belica” to evaluate the use of a chilling and forcing model for a better understanding of flowering time dynamics under a changing climate. The flowering process is influenced by high diurnal temperature ranges (DTRs) during the pre-flowering period, resulting in earlier flowering. Despite annual fluctuations due to various climatic factors, an increase in DTRs has been observed in recent decades, although the mechanisms by which olive trees respond to high DTRs remain unclear. The chilling requirements are still well met in the region (1500 ± 250 chilling units), although their total has declined over the years. According to the Chilling Hours Model, chilling units—referred to as chilling hours—represent the number of hours with temperatures between 0 and 7.2 °C, accumulated throughout the winter season. Growing degree hours (GDHs) are strongly correlated with the onset of flowering. These results suggest that global warming is already affecting the synchrony between olive tree phenology and environmental conditions in the northern Mediterranean and may be one of the reason for the green drop. Olea europaea L. phenology chilling hours diurnal temperature range climate change oljka fenologija hlajenje dnevni temperaturni razpon podnebne spremembe true false true Angleški jezik Slovenski jezik Članek v reviji 2025-08-06 14:22:18 2025-08-06 14:22:24 2025-08-07 04:13:31 0000-00-00 00:00:00 2025 0 0 19 str. iss. 8, art. 156 Vol. 13 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 634.63 2225-1154 10.3390/cli13080156 243661571 Analysis_of_Olive_Tree_Flowering_Behavior_Based_on_Thermal_Requirements__A_Case_Study_from_the_Northern_Mediterranean_Region.pdf Analysis_of_Olive_Tree_Flowering_Behavior_Based_on_Thermal_Requirements__A_Case_Study_from_the_Northern_Mediterranean_Region.pdf 1 07E94318D550C035A7BAF6EE8F23146F 5de3ad5291849638b69975f2e38b3da041eb5c1fcf409eb3f4b66336f1baaae5 2626bb71-72c1-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213993 https://www.mdpi.com/2225-1154/13/8/156 1 f241b7de-72bf-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213992 Biotehniška fakulteta 0 0 0