This is not a clear effect of boron fertilizers on fruit yield and hazelnut quality. However, soil boron deficiency is a common nutrient problem for hazelnut growth. In this study, the effect of boron fertilizations of foliar and soil was investigated on the quality of hazelnuts (Corylus avellana L.) in two provinces in Turkey between 2013 and 2014. The experimental trials were carried out in soil application (0.0, 3.0 and 6.0 g per Ocak) and foliar spraying (0 and 300 mg B L-1). Results show

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... at compared with the control, soil and foliar application of boron increased hazelnut yield and quality. Due to the two-year average, the highest yield of the hazelnut in Samsun-Çarşamba was obtained from the application and dose of S1. A 36.70% increase in hazelnut yield was achieved by applying B (3g Ocak-1) from the soil in comparison with the control application. It was a 20 % increase in Ordu-Ulubey district. The highest kernel ratio of hazelnut was obtained from F1S2 applications for the two districts. Increases were observed at Samsun-Çarşamba (10%) and Ordu-ulubey (7%). Results showed that there was also a positive association between the B leaf concentration and hazelnut yield and kernel ratio and no significant differences between foliar and soil applications on hazelnut quality. As a result of this study, and with increasing yield, foliar applications of B are an effective method of supplying sufficient B for the flowers. In addition, B leaf applications are more appropriate than soil B application.