Hidrotecnia and Melioration Institute. Irrigation regime of grapevine in the Bulgarian conditions. Hidrotecnia and Melioration Institute, Sofia, Bulgaria, 1998
The water requirements of grapevines in Bulgaria conditions vary depending on the age of the plant, biomass and weather conditions during the different stages of crop development. The vine requires the highest water needs during the end of flowering to fruit formation, with an average evapotranspiration 3.8 mm / day during that stage. The total vine evapotranspiration of Gemza variety is of 424 mm / ha.
The total vine evapotranspiration of Gemza variety, grown in a soil chernozem Carbonated is of 424 mm / ha. In different periods of crop evapotranspiration mm average per day is:
From beginning vegetation at the beginning flowering –1.9 mm / day
From beginning of flowering until the end of flowerin—–2.2
Since the end of flowering to fruit formation—————– 3.8
Since the formation of the fruit to harvest ——————–1.6
The total water requirements generally ranges from 800-2100 m3/ha for different regions of the country, depending on it: the variety used, the type of soil and climatic factors of which the rainfall regime has a decisive influence on the demand crop water. The number of applied irrigation varies with the irrigation techniques used in cultivation: gravity irrigation, sprinkler and drip.