LAST RESULTS IN THE EVALUATION OF 'NEGRET' HAZELNUT CULTIVAR GRAFTED ON NON-SUCKERING ROOTSTOCKS IN SPAIN
Negret is the most widely planted hazelnut cultivar in Tarragona (Spain). One of the disadvantages of this cultivar is the high suckers emission, causing high maintenance costs yearly. In 2000, a trial to select new and non-suckers emission rootstocks for hazelnut was established at IRTA-Mas de Bover. Negret-N9 selection was grafted onto four clonal rootstocks (Dundee and Newberg, two open pollinated C. colurna seeds; the low suckers emission cultivar Tonda Bianca and IRTA-MB69 selection) and compared to the own-rooted Negret-N9. The trial was statistically designed by randomized complete block with ten replications, and one tree per replication and clonal rootstock. Vigor, suckers emission, production and nut characteristics have been evaluated during nine years. The last five years of the trial, kernel quality properties were added to the characterization. Results showed that some rootstocks have a strong influence on vigor and yield of Negret - N9 during the period 2003-2011. Dundee and Tonda Bianca rootstocks showed the highest vegetative growth, whereas Dundee, Newberg and MB-69 showed the lowest suckers emission. Yield performance was highest in Dundee and contrary to Tonda Bianca that showed the lowest yield. Referring to kernel quality studies, rootstocks have a positive influence on oil stability and induces a brown light color in the kernel pellicle, in contrast with the brown dark color in own-rooted Negret N9. Kernel fatty acid composition was also influenced by the kind of material used (own-rooted or grafted trees).
Rovira, M., Cristofori, V., Silvestri, C., Celli, T., Hermoso, J.F., Tous, J. and Romero, A. (2014). LAST RESULTS IN THE EVALUATION OF 'NEGRET' HAZELNUT CULTIVAR GRAFTED ON NON-SUCKERING ROOTSTOCKS IN SPAIN. Acta Hortic. 1052, 145-150
Corylus avellana L., clonal rootstocks, vigor, yield, suckers emission, oil stability