Spatial differences of night temperature in hilly regions and its horticultural importance

摘要

In the Carpathian Basin freezing injury is one of the mainyield limiting factors in fruit production. In our research the microclimaticdifferences of night temperature values were studied. On thenorthern side of B丯ukk Mountains, at two nearby (app. 1 km distance)locations, parallel temperature measurements were conducted from 17thApril until 4th December 2010 (HOBO UA-002 logger). The measuringpoints represent the fruit gardens located in valleys (260 m a.s.l) and onslopes with medium cold air drainage (330 m a.s.l), respectively.The critical frost events occur mainly (in the vegetation period almostexclusively) at clear, calm nights. In this type of weather the valley isgenerally 3-5.C colder than the slope position 70 m above it. Thesevalues hint to the enormous importance of site selection of orchards whichis probably the simplest and most effective way to reduce frost risk.