Does alteration of 'Koroneiki' olive tree architecture by uniconazole affect productivity?

► High-density-planted 'Koroneiki' olive trees, aged 5-8 years (2007-2010), were soil-treated uniconazole to reduce their growth rates. ► 0.1 and 0.2 g uniconazole per tree reduced 2007-2010 trunk cross-sectional area increment, 2009-2010 accumulated pruned branch weight, tree height, and overall tree size. ► 0.2 g uniconazole per tree reduced productivity. ► It was postulated that productivity reduction is a consequence of the altered 'Koroneiki' olive tree architecture, which decreases light interception in the tree canopy.