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Start of honey flow and temperature sums of net cumulative honey flow in adjacent RP-regions, Koblenz, Rheinhessen-Pfalz (RH-Pfalz) and Trier 2012–2021. (A) Calendar day of first minimum cumulative weight (fMinCal), and (B) temperature sum on that day (GDD-day). The calendar day was constant among regions per year, whereas GDD-day differed significantly between regions (see text).
