Water balance in potted grapevines (Vitis vinifera L. cv. Bobal) under drip irrigation using a weighing lysimeter. Some experimental data

A water balance in potted grapevines (Vitis Vinifera L. cv Bobal on 110R) was established in order to validate a weighing lysimeter prototype. The crop was drip irrigated for three months and irrigation scheduling was based on the crop evapotranspirative demand that was calculated with data from a nearby agrometerological station. The experimental plot of 328 m2 is located at 38 degrees 4' 10.17 '' N, 0 degrees 59' 6.81 '' W and 19 meters above sea level. A weighing lisymeter prototype was used to estimate the gain or loss of irrigation water according to weight variations, and weekly irrigation water volumes were measured using a volumetric water meter. In order to separate crop evapotranspiration and water evaporation an additional experiment was developed covering the pot soil surface with a polyethylene film. Applied irrigation water volumes and weight variations were compared. Water balance parameters are shown and discussed in detail. Based on water balance some crop coefficients were estimated.