In Slovenia, all areas of crop production are exposed to the negative effects of climate change. In this doctoral dissertation, a set of agroclimatic indicators was developed to represent the impact of climatic conditions on the growth of wheat (Triticum aestivum L.) and maize (Zea mays L.). Additionally, an indicator for the occurrence of the pest Spodoptera frugiperda (J. E. Smith) was developed, along with an agroclimatic indicator of frost occurrence in regards to apple (Malus domestica Borkh.), sweet cherry trees (Prunus avium L.) and grapevines (Vitis vinifera L.). The latter showed that the risk of spring frost in apple, cherry, and grapevine will continue to increase by the end of the century, as will the risk of pest occurrence, which is currently low under current climate conditions. A principal component analysis of indicators for wheat and maize showed that heat stress is the main limiting factor for maize, while a positive correlation with overwintering conditions was calculated for wheat. For both crops, a positive correlation with high precipitation conditions was also calculated. The results of climate projections for the 21st century indicate a lengthening of the growing season, an increase in the frequency of heat stress conditions for wheat and maize, nighttime heat stress and high humidity, and more frequent conditions with a warmer and longer growing season, with the trend being more pronounced under RCP8.5. Projections through the end of the century also indicate a mildening of winter conditions and a moderate increase in the frequency of conditions with high precipitation.
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