Effects of genotype, fertilization and microclimate on visitation by pollinators and yield of sunflower were analyzed in the course of 2001 in a stationary field trial established at Rimski Šančevi experiment field. We analyzed four sunflower hybrids (Velja, NS-H-45, NS-H-111 and NS-H-702) grown in four fertilization variants. Bee visitation was monitored during flowering, making nine counts per day. Nectar content and weather parameters were observed at the same time. Seed yield per head measured after harvest. Significant yield differences were established among the hybrids as well as among the fertilization variants. Nectar content significantly differed among the hybrids (3.8 - 8.9 mg/20 flowers), and the fertilization variants (5.0 - 7.5 mg/20 flowers). Differences in bee visitation frequency observed among the hybrids and fertilization variants were in close association with the ranking of the hybrids for nectar content. Air temperature had a higher influence on bee visitation than relative air humidity. The influence of wind was insignificant. The daily dynamics of bee visitation showed one or two peaks, depending on the dynamics of flowering of individual hybrids.Izvršena je analiza uticaja genotipa, đubrenja i mikroklimata na posetu pčela i prinos suncokreta. Ispitivanja su obavljena na Rimskim Šančevima, na stacionarnom ogledu, u 2001. godini. Ispitivana su 4 hibrida suncokreta (Velja, NS-H-45, NS-H-111 i NS-H-702), na 4 varijante đubrenja. Praćenje posete pčela tokom perioda cvetanja, tokom dana vršeno je u 9 navrata. Utvrđen je sadržaj nektara i prinos semena po glavi kao i pojedini vremenski činioci u vreme opažanja. Utvrđene su značajne razlike u prinosu između hibrida, a takođe i između pojedinih varijanti đubrenja. Sadržaj nektara u cvetu značajno se razlikovao između pojedinih hibrida (3,8 - 8,9 mg/20 cvetova), i varijanti đubrenja (5,0 - 7,5 mg/20 cvetova). Poseta pčela se razlikovala između pojedinih hibrida i varijanti đubrenja, a rang hibrida bio je isti kao i kod sadržaja nektara. Temperatura vazduha pokazala je jači uticaj na posetu pčela od relativne vlažnosti vazduha dok vetar nije pokazao značajan uticaj. Dnevna dinamika posete imala je jedan ili dva maksimuma u zavisnosti od vremena cvetanja pojedinih hibrida
