The effects of gibberellic acid (GA3) and fertilization combinations on yield and quality of grapes of sultani çekirdeksiz cultivar

In this research, GA doses (H0:0, H1:35, H2:70, H3:140 ve H4:210 ppm/year) and fertilizer doses (G0:0 (control), G1:0,5 (7,5 kg/da N; 3 kg /da P205) ; G2:1 (15 kg /N; 6 kg/da P205); G3:1,5 dose (22,5 kg/da N; 9 kg/da P205) were applied on Sultanina Seedless cvs. (Vitis vinifera L.) in the completely randomized block design with split plots as three replications. As the GA3 dose increased, total fresh grape yield and cluster weight increased, but total soluble solid (TSS) and maturity index decreased. When compared with control, GA3 applications increased berry weight, but berry weight did not changed among the GA3 applications. All applications did not affect table grape yield. Fertilizer applications did not affect total fresh grape yield. Raisin grape yield and drying index decreased when high GA3 doses applied. All GA3 applications in G0 fertilizer applications did not affect raisin berry size. H1 dose in G1 or H2 dose in G2 and G3 fertilizer applications founded better applications for raisin berry size. GA3 applications resulted in consuming more phosphor (P) and potassium (K) minerals. P applications in G1 and G3 doses at the verasion stage increased plant phosphor to sufficient level.Yield and quality results together with soil and leaf analysis was examined for raisin grape growing. According to that, it is advised to use H1 dose in G1 and H2 dose in G2 and G3. For table growing, when table grape yield, berry weight and total soluble solid values considered, H1 and H2 doses can be advised. If fresh berry weight is increased by the modified irrigation methods, H3 and H4 doses also can be advised