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    Cutting parameters of some grape varieties subject to the diameter and age of canes
    (Parlar Scientific Publications, 2019) Esgici R.; Goksd Pekitkan F.; Ozdemir G.; Guzel E.; Sessiz A.
    Grape is an important product for the economy of Turkey and it will continue to play an important role in worldwide grape production due to its large number of varieties, favorable ecological conditions and large production areas. However, pruning and harvesting of grape berries are performed manually with a labor intensive procedure. Therefore, production cost is very high and labor efficiency is low in vineyards. However, pruning and harvesting are the most critical operations in vineyard management. Information regarding the cutting of canes of different grape varieties is very important for a proper harvest machine design as well as the efficient use of energy. In this study, cutting force and cutting energy were measured by considering the factors of grape canes diameter and age of canes. One and two year old grape canes from the Genc Mehmet, Bogazkere and Okuzgozu local varieties were used as experimental material. The canes were obtained from a commercial vineyard in the Diyarbakır province located in southeastern Turkey. Lloyd, LRX plus series, materials testing machine was used for cutting tests. Statistically significant differences were determined between the cutting properties of grape varieties. The cutting force and cutting energy increased with increasing diameter and age of canes. © 2019 Parlar Scientific Publications. All rights reserved.
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    Effect of inoculation with mycorrhizal fungi on growth and nutrient uptake of grapevine genotypes (Vitis spp.)
    (2010) Ozdemir G.; Akpinar C.; Sabir A.; Bilir H.; Tangolar S.; Ortas I.
    The effects of Arbuscular Mycorrhizal (AM) fungus species Glomus mosseae and Glomus intraradices on growth and leaf nutrition status of grapevine rootstocks, '5 BB' (Vitis berlandieri x Vitis riparia), '1613 C' (Vitis solonis x Vitis riparia cv. 'Gloire de Montpellier'), '41 B' (Vitis vinifera L. cv. 'Chasselas' x Vitis berlandieri) and Vitis vinifera L. cv. 'Early Cardinal', were investigated. Dormant cuttings of representative genotypes were rooted in perlite and transplanted into black polyethylene bags containing fumigated growing medium. Mycorrhizal inoculation was performed using 1000 mycorrhizal spores per plant, 50 mm under rooted grape cuttings. The development of the grapevine genotypes was significantly affected by mycorrhizal inoculation. Both fungi promoted significant increases in shoot and root growth and leaf P and Zn concentrations. Considering the overall results, G. mosseae appears to have a greater effect on shoot growth parameters, and G. intraradices appears to have a greater effect on root growth parameters and leaf P and Zn concentrations. Therefore, G. intraradices would be anticipated to aid vines to overcome element deficiencies in especially areas where P and Zn deficiency predominate. © Verlag Eugen Ulmer KG, Stuttgart.
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    Physiological and biochemical responses to iron stress conditions depend on grapevine genotype
    (Parlar Scientific Publications, 2017) Ozdemir G.; Tangolar S.; Dasgan H.Y.
    One of the most common nutritional deficiencies in vineyards is iron chlorosis due to high lime content and pH. In this study, physiological responses to iron deficiency stress were compared in nine grapevine genotypes. For this purpose, plants were grown in hydroponic culture having low iron [(-) Fe] or sufficient iron/control [(+) Fe] conditions. The [(-) Fe] plants were grown with 10-6 M Fe EDTA for 40 days followed by 2×10-7 M FeEDTA for 20 days. [(+) Fe] plants were grown with 10-4 M Fe EDTA. To create iron stress, 10 mM NaHCO3 was added to the solution. In plants, active and total iron contents (mg/L), shoot active and total iron contents (mg/L), leaf chlorophyll status (SPAD), and root ferric chelate reductase enzyme activity were examined. All parameters were reduced in plants that were grown under iron deficient conditions. The highest active iron concentration in leaves was 108.27 mg/L in 1103 P grown in [(+) Fe] conditions. The chlorophyll content of leaves was 27.93 (1616 C) in [(+) Fe] conditions. The ferric chelate reductase enzyme activity of roots was higher in iron stress conditions. The highest level was 1395.78 in the 140 Ru genotype. © by PSP.