Abstract: In this study, the effects of B-Zn fertilization on the yield, cluster drops and nut traits in hazelnut were examined during 2001-2002. Tombul and Cak ldak hazelnut cultivars were used. The doses of 150 and 300 g of a B-Zn fertilizer consist of 10.0 % B, 4.0% Zn were used per ocak in January 2001. This fertilizer was applied with broadcast in Cak ldak cv. and with ground in Tombul cv. Following characters were examined: nuts per cluster, nut and kernel weights, kernel percent (%), shell thickness (mm), good kernel (%), blank nut (%), shriveled kernel (%). In addition, cluster drop (%) was examined in both years. Consequently, the best yield and nut traits were obtained from dose of 150 when the B-Zn fertilizer applied to the ground in Tombul cv. and dose of 300 when it applied to broadcast in Cak ldak cv.