QUALITATIVE AND PRODUCTIVE RESPONSE OF ‘TEMPRANILLO’, HEAD TRAINED IN THE SEMI-ARID CONDITIONS OF THE DUERO VALLEY (SPAIN), TO THE VARIATION OF IRRIGATION DOSES

The effect of irrigation doses on ‘Tempranillo’ has been studied in a trial that was carried out through the period 2005-2008 in head trained vines, planted in 1993, with 2.20 m by 1.15 m of distance between them, in the semi-arid climate conditions typical of the centre of the Iberian peninsula (Duero valley). The study was focused on the qualitative and productive response of vineyard to the increase of irrigation doses, by means of comparison between treatments of very reduced irrigation (20% ET_o) and moderate irrigation (40% ET_o), both applied from the vegetative growth stopping until harvest.
The increase of irrigation doses caused a higher grape yield, due to all yield components, with an increase of berry size, and a higher vegetative development, as shown by pruning weight.
The increase of irrigation from 20 to 40% ET_o affected some quality aspects of grapes, causing an increase of total acidity and a variation of sugar concentration.
This increase of irrigation provoked an increase of skin water content and a reduction of whole phenolic substances in the skin, although the effect was different depending on the type of phenolic compound, having observed a reduction of anthocyanins, while the proanthocyanidins increased and the catequins showed a more variable tendency.

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on the Effect of Climate Change on Production and Quality of Grapevines and their Products

J. Yuste, M. Alburquerque, R. Yuste, E. Gamero, E. Valdés

anthocyanins, catequins, polyphenols, proanthocyanidins

https://doi.org/10.17660/ActaHortic.2012.931.48