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    Effect of different zinc application methods on leaf Zn, Fe, Cu and Mn concentrations of ungrafted and grafted Flame Seedless grapevine cultivar and rootstocks (Vitis sp.)
    (Wfl Publ, 2011) Ozdemir, Gultekin; Ekbic, Hatice Bilir; Erdem, Halil; Torun, Bulent; Tangolar, Semih
    A two-year vineyard experiment was conducted to investigate the effects of zinc applications on leaf Zn, Fe, Cu and Mn concentrations of ungrafted and grafted grapevines 'Flame Seedless' (V. vinifera L.) cultivar and the rootstocks 5 BB (V. berlandieri x V. riparia), SO4 (V. berlandieri x V. riparia), Cosmo 20 (V. berlandieri x V. riparia), Fercal ((V. berlandieri x Cabernet Sauvignon) x (V. berlandieri x Colombard)), Dogridge (V. champinii), Harmony (Dogridge x 1613 C), 1613 C (V. solonis x V. othello). Zinc applications were performed as 1) Zn = 0 (0 kg ha(-1) as control), 2) soil application (23 kg ha(-1)), and 3) soil (23 kg ha(-1)) plus leaf (0.2% Zn) applications of Zn. As Zn source, ZnSO4 center dot 7H(2)O formulation was used. Leaf samples were gathered at full blossom and veraison stage in order to determine Zn, Fe, Cu and Mn concentrations. The results showed that Zn applications had significant influence on the Zn, Fe, Cu and Mn levels of grapevine genotypes. Soil plus leaf application of Zn resulted in the highest Zn, Fe, Cu and Mn concentrations of leaves. A wide variation was determined among the genotypes in terms of microelement uptake. Leaf Zn, Fe, Cu and Mn concentrations were higher in the own-rooted Flame Seedless than those of the vines of the same cultivar grafted on different rootstocks.
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    The effects of different nitrogen doses on yield, quality and leaf nitrogen content of some early grape cultivars (V. vinifera L.) grown in greenhouse
    (Academic Journals, 2010) Ekbic, Hatice Bilir; Ozdemir, Gultekin; Sabir, Ali; Tangolar, Semih
    Nitrogen deficiency is a worldwide problem, causing restrictions in productivity of many horticultural produces. Particularly, the issue is compounded when the greenhouse production is employed. Therefore, reliable knowledge on proper application of nitrogen ensures not only satisfactory yield but also balanced vegetative and reproductive growth in plants. This study was thus conducted to investigate the effects of different nitrogen doses (10, 20 and 30 kg N da(-1)) on some quality properties with petiole nitrogen content of grape cultivars 'Early Cardinal' (EC), 'Yalova Incisi' (YI) and 'Ergin Cekirdeksizi' (ER) grown in plastic greenhouse for two years. Overall results indicated that cluster weight, cluster length and yield values increased depending on the nitrogen doses. On the other hand, increasing nitrogen applications generally resulted in higher petiole nitrogen content. The highest petiole nitrogen values were obtained from the treatment of 30 kg N da(-1) for two phenologycal periods (1.29 and 1.59% for full bloom and veraison, respectively). Considering the general investigations, 20 kg N da(-1) application could be recommended in terms of nitrogen supply under such conditions.