The influence of the probable climate change on the vegetation phenophases on the Merlot variety in the Dealu Bujorului vineyard

Abstract

The development of vegetation and fructification phenophases in vine is determined by the cumulative action of daily average temperatures exceeding the value of 10ºC, a value that is considered a biological threshold for vine. In the climatic conditions of the last few years a random evolution of the amount of active and useful temperature levels necessary to trigger the phenological stages was observed. The research was carried out during 2008-2017 on the Merlot variety in the experimental field of the Research and Development Station for Viticultural and Winemaking Bujoru. The main objective of the paper is to establish the active and useful thermal balance necessary for the development of the vegetation phenophases and the determination of the trend of their evolution. There is a slight tendency to increase the active temperature for budburst and ripening phenophases and a decreasing pronounced trendfor the flowering and harvesting phenophases.