Effect of Hydrogen Cyanamide on Flowering, Yeild and Fruit Quality of Actinidia deliciosa cv. Hayward Kiwifruit in The East of Guilan Provinve

In this study, the effects of different hydrogen cyanamide (HC) concentrations (0, 3, 4, 5 and 6) on flowering and fruit quality of Hyaward kiwifruit during 5 weeks before normal budbreak was investigated. The results showed that HC spray advanced budbreak for 9 days, even and short bud break period for 9 days as compared to control. Treatments of 4, 5 and 3% HC showed budbreak of 67.74, 65.9, 63.73 %,respectively as compared to control (58%). Kiwifruit vines sprayed with 3 and 4% HC showed the highest king flower per winter buds with 2.11 and 1.55, respectively as compared with control (1). The highest fruit yield was found in 5, 4 and 3% HC treatment with 103, 99 and 90 kg per vine and the lowest value was found in control and 6% HC with 51 and 63 kg per vine, respectively. The mean fruits weight of HC treated vines ranged 110-134 g as compared to control (100 g). No significant difference was found between HC treated and control vines for fruit soulable solid content, dry matter and firmness. Overall, the results showed that HC treatment specially at concentration of 3% increased fruit yield by increasing king flower number per winter buds, without negative effects on fruit internal quality.