زمان گل انگيزي و اثرهاي محلول پاشي با عناصر ازت، روي و بور بر ويژگي هاي كيفي و عملكرد انگور (Vitis vinifera L) رقم سياه در سي سخت

Time of Flower Induction and Effects of Foliar Application of N, Zn and B on Qualitative Chariceristics and Yield of Grapes (Vitis vinifera L.) ʹSiah

Two separate experiments were conducted to determine the time of flower induction and the effects of foliar application of N (Urea), Zn (Zinc sulphate) and B (Boric acid) on the qualitative characteristics and yield of grape ʹSiahʹ during 2004-2006, in Sisakht region. In the first experiment from June to September every two weeks interval girdling and defoliation was imposed on 3 branches and 3 vines. During the following spring, it was found that flower induction occurs in early July in this area. In the second experiment, the effect of foliar application of N, Zn and B with 8 treatments (control, N, Zn, B, N+B, N+B, B+Zn and N+Zn+B, at the concentration of 0.5% each) in a completely randomized block design with 4 replicates were studied. The Results showed that effect of foliar application treatments on the %TSS, %TA, TSS/TA, pH and yield were significant (P<%1). Application of combination treatment (N+B, 0.5%) increased the fruit quality than other treatments. Also application of all foliar treatments increased the yield in the year of treatment and in later year than untreated control.