Browsing by Author "Akça, Y."

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Studies on Selection of Apricots With Good Fruit Quality and Resistance To Late Spring Frosts in Gevaş Plain
(International Society for Horticultural Science, 1999) Akça, Y.; Şen, S.M.
Turkey exports more than 44.000 tons of dried apricot. For many years the apricot production of Turkey has been unregulated because of late spring frost. Resistance to late frosts, growth vigor, productivity, pomological and phenological characteristics were examined in native apricot at Gevaş in 1995 - 1996. Apricot trees with resistance to late spring frost were selected at 1730 m. The lowest temperature at full blooming time was - 1.2°C in 1995. The whole trees were damaged in flowering time, except 45 types that flowered 10-15 days later than Hasanbey and others trees. At the end of the study 28 types with high yield and resistant to late spring frost were selected. In these types, average fruit weight varied between 12.70±1.42 to 30.19 ±5.1 g. Seed weight varied from 0.88±0.1 and 2.07±0.2 g. Soluble solid content varied between 13.57±1.2 - 28.63±12.54.%.
Study on the Frost Tolerance of Important Apricot (Prunus Armenica L.) Cultivars
(International Society for Horticultural Science, 2000) Akça, Y.; Muradodlu, F.; Murat Asma, B.
This study was conducted between the years of 1996-1998 in order to determine frost tolerance of Adilcevaz 5, Çölodlu, Hacýhalilolu, Hasanbey, Kabaapý, Kadýodlu, Luizet, Paviot and Tokalodlu apricot cultivars and determine the relationship between tolerance to frost and macro and micro elements contents. Samples of flower buds were collected and exposed to artificial freezing tests periodically between December and March. Importance differences were found between the ability of cultivars to tolerate frost. The frost tolerance ability of the investigated cultivars was found to be higher in January and February, than in December or March. Kadýodlu,Çölodlu, Kabaajpý, Adilcevaz 5 were found to be cultivars exhibiting tolerance to frost. Nitrogen and Magnesium levels did not show any important changes during the experimental periods. However, the levels of K and Cu increased regularly. In all the investigated cultivars, the level of Ca, Mn and Zn increased from January to February, in parallel with the frost tolerance ability of the tested cultivars, but decreased in December and March. The level of Na was found to be low in January and February but high in December and March.
A Study on the Genetic Variability and Selection of Superior Walnut (Juglans Regia L.) Trees Within Seedling Population Ofaround of Van Lake
(International Society for Horticultural Science, 2001) Akça, Y.; Sen, S.M.
This study was conducted out to determine genetic variabilitiy and to select superior walnut trees within seedling population of around of Van Lake in 1993 - 1995. In this study were examined over 25.000 walnut trees with high heterozygosity from point of yield (lateral fruitfulness %), tolerance to anthracnose and nut quality factors. The seedling population of around of Van Lake, exhibits tremendous genetic variation in different aims of walnut breeding. 23 types were selected according to yield, tolerance to anthracnose, diseases and pests and nut quality. In these types average nut weight, varied from 9.36±0.8 to 18.60±1.3 g, kernel weight varied 6.09±0.8 - 9.58±0.8 g, kernel rations varied from 50.89% to 65.17 %, shell thickness varied between 0.91±0.1 - 1.76±0.1 mm and nut diameter varied from 29.93±0.9 to 40.44±1.3 mm.
Study on the Selection of Superior Walnut Trees in Hizan (Bitlis) Populations
(International Society for Horticultural Science, 2001) Akça, Y.; Sen, S.M.
This study was conducted out to determine genetic variability and select superior walnut types within seedling population of Hizan (Bitlis). Hizan climatic environment is unsuitable for walnut trees. Walnut trees in Hizan population are generally tolerant to winter cold and late spring frost. Hizan seedling population exhibits tremendous genetic variation in pomological and phenological characteristics. Lateral fruitfulness of selected types are highest and leafing time is very late according to another trees. Selected type can use for walnut improvement as genetic resources . Nut quality of these types are not as good as of any standard walnut cultivar. But these types must be collected and propagated in research centre. In selected types nut weight varied between 7.49±0.75 - 13.93±0.75 g kernel weight varied between 2.61±0.13 - 5.73±1.13g, shell thickness changed 1.32±0.33 - 2.45±0.44 mm and nut diameter varied between 22.30±1.1232. 26±2.95 mm. Range of variation in nut colour is between dark brown to dark yellow.