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A field experiment was performed from 2006 through 2008, to evaluate the effect of a postveraison regulated deficitirrigation (RDI) on the yield and quality of the seedless table grape ‘Autumn Royal’, especially on berry cracking.Three irrigation treatments were applied: a control (T1), irrigated at 100% of the net irrigation requirements (NIR),and two RDI treatments (T2 and T3) irrigated as T1 except from postveraison till harvest, when different percentagesof NIR were applied, 80 and 60% NIR in T2 and T3, respectively. Irrigation timing was split from one daily applicationduring 2006 and 2007 to two daily applications during 2008 Average yield in T1 was 46.3 and 46.1 t ha –1 in 2006 and2007, respectively. RDI treatments presented similar yield values to T1, with a water saving in T3 of 94 and 144 mmin 2006 and 2007. However, in 2008 T3 treatment showed a yield reduction with respect to T2 of 13 t ha –1 . The maximumyield was achieved in treatment T2 (52.6 t ha –1 ) and the minimum in treatment T3 (39.3 t ha –1 ) with a water differenceof 54 mm. Berry cracking was greater than 10% in 2006 and 2007 without differences between treatments, while itwas negligible in 2008. This result suggests that the change in irrigation timing performed in 2008 could have abeneficial effect in berry cracking since two irrigation applications were performed in that year, one at night and theother one at noon. However the results are not conclusive.This study has been financed by the RTA2005-00038- C06-00 project (Education and Science Ministry, INIA) and the CSD2006-00067 project (CONSOLIDER- INGENIO 2010)

Response of table grape cultivar ‘Autumn Royal’ to regulated deficit irrigation applied in post-veraison period