Influence of different parameters on the characteristics of hazelnut (var. Grada de Viseu) grown in Portugal

Abstract “Grada de Viseu” is an indigenous hazelnut variety from Portugal, and it considered by the producers as most important in terms of production productivity. Therefore, aim this study was to assess influence harvest year (2017/2018/2019) location (Viseu/Faia) on some physical chemical properties Viseu,” namely biometric parameters, colour, true bulk densities, texture parameters (hardness friability), composition. The results showed that fruits samples harvested 2019 had higher values height, width, thickness. Hazelnuts 2018 a clearer shell, independently production, but only Faia kernel. As for texture, grown Viseu harder shell more resistant fracture, whereas sample In all cases, fat major component. water activity greater than 0.62, meaning its stability not guaranteed. presented induction period and, therefore, one with highest oxidation stability. be best predictor almost every characteristics. general, possible verify harvesting geographical