Determination of Water Requirement, Crop Coefficient and Water Productivity of Grapevines Trained in Two Trellises and Creeping Systems in Malekn Region

Vineyard irrigation scheduling according to actual crop water requirements in the arid and semiarid regions is crucial to improve water productivity and maintain sustainable production. This experiment was carried out to evaluate water consumption (), crop coefficient () and water productivity of grapevine in the Malekan region located in the eastern Azerbaijan province. Two different field experiments in the form of complete randomized design with three replications were carried out during the 2020 growing season in two vineyards with trellis and creeping trained systems under subsurface drip irrigation (SDI). The grape's  was determined by measuring the components of the water balance equation including variations of soil moisture at different levels of the root zone. In order to prevent water stress, the soil moisture content was kept to the range of the readily available water during the whole growing period. The grape's  was 451, 394 mm, respectively, in the trellis and creeping system. Accordingly, water productivity was 5.83 and 6.1 kg per cubic meter of . Maximal daily  was 0.8–0.9, respectively, in the trellis and creeping system, implying that the maximum daily actual water consumption was lower than the calculated corresponding reference evapotranspiration.