The agronomic behaviour of a vineyard (Vitis vinifera L., cv. 'Airén') has been studied in Villarrobledo (Albacete), during the 2000 and 2001 growth season, from quantitative and qualitative points of view, according to different irrigation scheduling. This strategies have been designed, reducing and increasing in a percentage, the water applied in a reference treatment, T1 (1700 m³ha^-1). The obtained results show, for the agronomic variables that define the grapevine production, that the increment of the irrigation volume applied in the agricultural growth season has produced a decrease of the efficiency of the water applied in grape and wood yield, although at this time, it has produced a growth with significant differences among treatments in both variables and in the specific weight of the berry. Regarding the variables used to define the quality of the must in the variety 'Airén ', it is observed that density, ºBaumé, total acidity and malic acid, present, in both growth seasons, differences statistically significant among treatments, being observed an increase of the concentration in grape harvesting of total acidity and malic acid and a decrease of ºBaumé and density, when an increment of the volume of applied water takes place, in the interval of rehearsed levels.