Demir Kok - Academia.edu (original) (raw)

Papers by Demir Kok

Applied Fruit Science/Applied fruit science, May 23, 2024

Black sea journal of agriculture, Mar 15, 2024

Mediterranean Agricultural Sciences, Apr 1, 2018

Ganos Dağları Trakya'nın güneyinde 40° 35' ve 40° 52' K ile 26° 58' ve 27° 27' D arasında yer alm... more Ganos Dağları Trakya'nın güneyinde 40° 35' ve 40° 52' K ile 26° 58' ve 27° 27' D arasında yer almaktadır. Kuzeydoğu-Güneybatı yönünde uzanmaktadır. Tekir Dağları'nın 945 m rakım ile en yüksek yeridir. 2014 yılı vejetasyon periyodunda yürütülen araştırmada örnekleme üç farklı yöntem izlenerek yapılmıştır. Arkeolojik kazılar sonucunda eski yerleşimlerin olduğu bilinen alanlar ve yakınlarında; köylerde yaşayan kişilerin belirttiği asmalardan ve asma bulunması olasılığı olan bölge ve dere yataklarının aranması şeklinde yapılmıştır. Örnekler 40° 53' K ile 27° 26' D ve 40° 35' K ile 27° 00' D koordinatları arasından toplanmıştır. "Second Edition of the OIV Descriptor List for GrapeVarieties and Vitis Species" listesinde yer alan 29 tanımlama karakteri kullanılarak irdelenmiştir. Alınan yaprak ve sürgün ucu örnekleri fotoğraflanmış ve incelenen özellikler açısından değerlendirilmiştir. Örneklerin DNA'ları "Doyle & Doyle DNA Ekstrasyon Protokolü" kullanılarak izole edilmiştir. Elde edilen DNA'lar buzdolabında muhafaza altına alınmıştır. Sonuç olarak Ganos Dağları'nın kuzey yamaçlarında yaklaşık 600 m, güney yamaçlarında ise 700-750 m rakımlardan sonra Vitis vinifera ssp. silvestris ve Vitis vinifera ssp. sativa örneklerine rastlanmamıştır. Köy ile yerleşim yerlerine uzak ve yoğun ormanlık alanlarda (aşırı gölge) bulunan bazı derelerde de örnek bulunmadığı; genellikle su bulunan nemli alanlarda, etrafı açık, kayalık derelerde yetiştiği görülmüştür. Bu asmaların arasından gelecekte ıslah çalışmalarında kullanılmak üzere yeni bireylerin eldesi ihtimali olduğundan vejetatif materyal alınarak in-vivo'da saklanmasının uygun olacağı ön görülmüştür.

Acta horticulturae, Mar 1, 2020

Journal of Tekirdag Agricultural Faculty, 2012

Spanish Journal of Agricultural Research, Dec 1, 2007

The annual pruning of vineyards produces shoot and leaf residues that have traditionally been fed... more The annual pruning of vineyards produces shoot and leaf residues that have traditionally been fed to sheep and goats. The aim of this work was to determine the forage and nutritive values of grapevine (Vitis vinifera L.) leaves plus summer lateral shoots at grape harvest and two post-harvest dates. The study cultivars were Cabernet Sauvignon, Merlot, Sauvignon Blanc and Sémillon, all grafted onto 5BB rootstocks. The leaves and summer lateral shoots were removed at the same time from each cultivar at three dates: grape harvest, 15 days post-harvest, and 30 days postharvest. No significant differences were seen between the cultivars in terms of their mean crude protein (CP) (45.44-46.33 g kg-1), crude fibre (CF) (37.12-37.50%), neutral detergent fibre (NDF) (324.63-324.87 g kg-1), acid detergent fibre (ADF) (247.44-249.44 g kg-1), potassium (2.11-2.14 g kg-1), calcium (3.85-3.95 g kg-1) or iron (0.037-0.038 g kg-1) contents at any of the three sampling dates. The highest fresh matter (1,765.33 kg ha-1) and dry matter (DM) yields (610.67 kg ha-1) were obtained from Sauvignon Blanc. The fresh matter yield, DM yield, CP, CF, NDF and ADF contents on the different sampling dates all differed significantly. The maximum fresh matter yield (1,925.33 kg ha-1), DM yield (634.67 kg ha-1) and CP content (61.67 g kg-1) were recorded at grape harvest. The potassium, calcium and iron contents ranged from 2.11-2.15, 3.86-3.92 and 0.036-0.038 g kg-1 respectively at all stages. The leaves plus summer lateral shoots of Cabernet Sauvignon, Merlot, Sauvignon Blanc and Sémillon grapevine cultivars can be beneficially fed to sheep, goats and cattle in some viticultural regions of Turkey and other parts of the world.

Due to its capability of delivering actual information about soil and plant cover, remote sensing... more Due to its capability of delivering actual information about soil and plant cover, remote sensing is considerable an integral tool for practical application of agriculture. Development of satellite based technologies provide significant point of view for not only science world but also agricultural activities to accurately measure variation in crop’s yield and soil. Precision farming is a new agriculture technology and samely for viticulture, which is designed to monitor, analyze and control grapevine production for optimizing of cost and ecological effects. In this system, great amount of data are collected for controlling of process and throughout of this process, this obtained data are made analysis via a computer. So, using of these new technologies are gradually becoming more important and images, which are taken from airplane and satellites help growers ripening rate, disease incidence, soil drainage and fruit quality. With these recent technologies, which are scanning of vineyards from above, viticulturists can improve teir grape quality and yield per acre.

Natural flora of Ganos Mountains in the Thrace region has an old and well-established viticulture... more Natural flora of Ganos Mountains in the Thrace region has an old and well-established viticulture and is a spreading area of natural hybrids. This research was performed to determine properties of grape and cluster and phytochemical properties of berries of 103 grapevine genetic materials (Vitis spp.) adapted to natural flora of Ganos Mountains in Thrace region of Turkey during the 2014 growing season. But physical measurement and chemical analysis were performed only in grapes from 31 grapevines that carried clusters during their maturity periods. Results revealed that 29,04% of grapevines examined had table grape properties (Vv43, Vv52, Vv54, Vv56, Vv57, Vv61, Vv62, Vv83, Vv100) and 70,96% of grapevines examined had wine grape properties (Vv6, Vv18, Vv23, Vv24, Vv27, Vv44, Vv45, Vv51, Vv55, Vv59, Vv63, Vv65, Vv66, Vv74, Vv75, Vv84, Vv87, Vv88, Vv91, Vv92, Vv98, Vv101). In terms of phytochemical properties of grapes from examined grapevines, while the highest total phenolic compoun...

Pakistan Journal of Biological Sciences, 2007

This research was carried out under the laboratory conditions of Department of Horticulture, Agri... more This research was carried out under the laboratory conditions of Department of Horticulture, Agriculture Faculty, Namik Kemal University in Turkey. In this research, salinity tolerance of V. vinifera subsp. sylvestris (C.C. Gmelin) ecotypes derived from Marmara Region and Akdeniz Region of Turkey was evaluated for various salinity levels at seed germination and plantlet stages. In addition to V. vinifera subsp. sylvestris (C.C. Gmelin); 5 BB Kober (V. berlandieri Planch. x V. riparia Michx.) and Isabella grape (V. labrusca L.) were also inserted to study to make a comparison. In order to determine responses of V. vinifera subsp. sylvestris (C.C. Gmelin) ecotypes, 5 BB Kober and Isabella grape to salinity, NaCl was added at 0 (control), 2.7, 5.4, 8.1 and 10.8 dS m(-1) to nutrient solution to achieve five salinity levels. Prior to study, all seeds were extracted from grape berries and stratified to be permeable to water by humidified sand. Afterwards, seeds were germinated under the different salinity stress conditions mentioned above. At the end of germination phases, germination percentages were calculated for all seed types and fresh weight (mg), dry weight (mg), water content (%), tolerance index values, Na+:K+ values were found out for shoots and roots of all plantlet types. No germination was observed during the germinations of all seeds under the stress conditions induced by 10.8 dS m(-1) NaCl treatment. On the basis of various salinity tolerance indexes, it was seen that Marmara Region plantlets were more resistant than Akdeniz Region for 8.1 dS m(-1) NaCl treatment. In conclusion, since V. vinifera subsp. sylvestris (C.C. Gmelin) ecotype from Marmara Region exhibits higher resistance to salinity, its rooted plant materials as grapevine rootstock can be used for salinity soil conditions in grape growing. Besides, it can be utilized from seeds of Marmara Region to obtain salinity resistant hybridized grapevine rootstocks in breeding programs of viticulture.

Journal of Tekirdag Agricultural Faculty, 2019

Trakya Univ. J. Sci, 2006

Bu makalede son yıllarda bağcılıkta karşılaşılan bazı problemler irdelenmiş ve bunların çözümüne ... more Bu makalede son yıllarda bağcılıkta karşılaşılan bazı problemler irdelenmiş ve bunların çözümüne yönelik öneriler getirilmiştir. Son yıllarda üzümün (özellikle şaraplık bazı çeşitlerin) değer fiyatını bulması ve üzümün getirisinin diğer tarım ürünlerine oranla daha iyi olması bağcılığa olan ilgiyi artırmıştır. Bu durum sektör dışındaki girişimcilerin dikkatini çekmiş ve onları bağ kurma yönünde yatırımlara teşvik etmiştir. Bağcıların bir kısmı örgütlenerek şarap üretimine yönelirken şarap sanayicilerinin çoğunluğu da bağ kurmaya önem vermiş, yeni girişimciler ise her ikisini birlikte kurarak entegre tesisler oluşturmaya başlamışlardır. Bağcılığın ve şarapçılığın entegre olması önemli ve yararlı bir gelişmedir, ancak bazı sorunları da yanında getirmektedir. 2004 yılı verilerine göre ilk yatırım masrafı 2.500-3.500YTL/da arasında (ilk 3 yıl) değişmektedir. Görülen odur ki, bağ kurma oldukça yüksek bir mali külfet getirmektedir. Bu nedenle bağın tesisinde ve sonrasında dramatik hatalara düşülmemelidir. Yeniden yapılanma sürecinde olan ve önümüzdeki 40-45 yıllık süreci etkileyecek olan bağcılık yatırımlarında yapılacak en ufak hatanın milli servetimizde önemli kayıplara yol açacağı göz ardı edilmemelidir.

Bu calisma, yapraktan uygulanan deniz yosunu ve humik asit uygulamalarinin saraplik Riesling uzum... more Bu calisma, yapraktan uygulanan deniz yosunu ve humik asit uygulamalarinin saraplik Riesling uzum cesidinde ben dusme doneminden hasat donemine kadar olan surecte (ben dusme donemi, ben dusmeden 15 gun sonra ve ben dusmeden 30 gun sonra olmak uzere) tanedeki biyokimyasal degisimleri incelemek icin gerceklestirilmistir. Arastirmada, deniz yosunu ve humik asit uygulamalarinin 0, 1000 ve 2000 ppm dozlarindan yararlanilmis ve bu dozlar asmalara 3 farkli fenolojik gelisme doneminde uygulanmistir. Yapilacak olcum ve analizler icin dusunulen ornek toplama donemleri arasinda en iyi kalite ozellikleri sirasiyla ben dusme doneminden 30 gun sonra, ben dusme doneminden 15 gun sonra ve ben dusme donemlerinden elde edilmis ve yapraktan uygulanan deniz yosunu ve humik asit uygulamalarinin Riesling uzum cesidinin tane biyokimyasal ozelliklerini degistirdigi gorulmustur. Aromatik uzum cesitleri acisindan da oldukca onemli olan serbest ucucu terpen bilesikler ile potansiyel ucucu terpen bilesikler yo...

Muskule grape variety which has table and late maturing attributes, was used for this study. Stor... more Muskule grape variety which has table and late maturing attributes, was used for this study. Storage of table grapes requires stringent control of gray mold, which is caused by Botrytis cinerea Pers. In spite of the fact that the use of sulfur dioxide (SO2) in controlling gray mould is common practice, it has some advantages and disadvantages. Thus, physical, natural organic elicitors and biological methods have been used for delaying decays. In this study, UV-C (0.25kJ m-2), salicylic acid (1, 2, 3mM) and Na2S2O5 (0.4g powdered sodium metabisulfate pads) treatments were used to reduce quality losses during the cold storage of Muskule grape. Treated clusters were placed into polyethylene container and packaged with polyethylene bags having 10.5 μ thicknesses and stored at 0±1 oC and 90±5% relative humidity throughout 100 day. At the end of 100 day, weight loss (%), soluble solids content (%), titratable acidity (g 100 mL-1), pH of fruit juice, sensory evaluation, view of cluster ske...

This study was carried out to determine influences of determine diverse doses of prohexadione-cal... more This study was carried out to determine influences of determine diverse doses of prohexadione-calcium (pro-ca) applied at two different periods such as 1st period (pre-bloom) and 2ndperiod (post-bloom) on monoterpene compounds and other grape quality attributes of cv. Gewurztraminer during the growing season of the 2010 in Tekirdag, Turkey. Research was arranged according to two factor-factorial randomized parcels with four replicates. Pro-ca has abilities to control vegetative growth and reduce berry sizes in grapevine. In this study, pro-ca applications caused to improvements in grape monoterpene compounds like free volatile monoterpene (FVT) and potentially volatile monoterpene (PVT) and other quality attributes of cv. Gewurztraminer. Among the application doses, the best results about grape quality characteristics of cv. Gewurztraminer were respectively obtained from pro-ca doses of 200 and 300 ppm when they were especially applied to grapevines at 1stperiod (pre-bloom)