THE INFLUENCE OF REGULATED DEFICIT IRRIGATION AND PARTIAL ROOTZONE DRYING ON SOME PHYSIOLOGICAL AND PRODUCTIVE CHARACTERISTICS OF VITIS VINIFERA L. 'VERMENTINO'
The objective of this experiment was to compare the effects of irrigation strategy (RDI vs. PRD) and the restoration volume (40% ETc vs. 80% ETc) on vegetative and productive characteristics of Vermentino. A three year trial was carried out in South Sardinia from 2009-2011. Main physiological and productive parameters on grapes and quality parameters on must and wine were collected. The results show a great difference in production between years. In 2009, the production of PRD increased compared to RDI. The sub-treatment 40% ETc showed the highest water use efficiency. In 2010, total soluble solid content in must was significantly greater in RDI 80% ETc compared to RDI 40% Etc, due to the volume of irrigation, and compared to PRD 80% ETc. Total acidity of must was significantly affected by irrigation treatments in 2010 and 2011. Among the wines there was a better aroma in the PRD 80% ETc wine (2009). In 2009, PRD showed a significantly lower level of stomatal conductance, whereas in 2010 a significantly higher net photosynthesis was observed in RDI. PRD 40% ETc was the most attractive irrigation treatment in terms of production, water use efficiency and quality parameters of must and wine, particularly in 2010.
Mameli, M., De Pau, L., Satta, D., Ventroni, G., Zucca, L., Del Piano, D. and Zurru, R. (2014). THE INFLUENCE OF REGULATED DEFICIT IRRIGATION AND PARTIAL ROOTZONE DRYING ON SOME PHYSIOLOGICAL AND PRODUCTIVE CHARACTERISTICS OF VITIS VINIFERA L. 'VERMENTINO'. Acta Hortic. 1038, 215-222
water stress, irrigation strategy, yield, must quality, wine quality