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Öğe Changes in yield and seed quality traits in rapeseed genotypes by sulphur fertilization(Springer, 2009) Egesel, Cem Oemer; Gul, M. Kemal; Kahrıman, FatihSulphur is considered more as a soil amendment to remedy alkaline soils rather than a fertilizer in crop production. However, as one of the macronutrients, just as N-P-K, it is able to have a direct and significant effect on yield and quality in some crops. There might be a sound potential of increasing seed yield and quality of rapeseed, the second important oil crop around the world, with the use of sulphur as a fertilizer in cultural practices. Our objective in this study is to determine the effects of sulphur fertilization on seed yield and several seed and oil quality traits in rapeseed. Five rapeseed genotypes were grown for two consecutive growing seasons in Canakkale, in a RCB design with three replications. The experimental plots were given 0, 100 or 200 kg ha(-1) sulphur along with a fixed amount of 240 kg ha(-1) N. Results indicated that sulphur fertilization had positive effects on seed yield and some of the seed and oil quality components. On the other hand, excessive sulphur fertilization, or naturally occurring high levels in the soil, may have adverse effects in elevating some undesired compounds, such as glucosinolates.Öğe Changes in yield and seed quality traits in rapeseed genotypes by sulphur fertilization (vol 229, pg 505, 2009)(Springer, 2009) Egesel, Cem Omer; Gul, M. Kemal; Kahrıman, Fatih[Anstract Not Available]Öğe Evaluation of 12 bread wheat varieties for seed yield and some chemical properties grown in Northwestern Turkey(Asian Journal Of Chemistry, 2008) Tayyar, Semun; Gul, M. KemalThe quality and yield of wheat grain have been increasingly becoming an important factor in cereal trading throughout the world. Breeders have to make many efforts to breed new cultivars giving more yields with high quality. In this research, grain yield, some agronomic characteristics (spike length, number of spikelets, number of grain per spike, grain weight per spike, harvest index, 1000 grain weight and plant height) and quality traits (hectoliter weight, grain moisture, protein, ash, falling number, gluten, gluten index, sedimentation and modified sedimentation) of 12 bread wheat varieties grown during the growing seasons of 2004-2005 and 2005-2006 were investigated. The purpose of the study was to determine the performances and some chemical compositions related to flour quality of different bread wheat genotypes under the ecological conditions of Biga, located in the northwest part of Turkey and to investigate the correlations among quality parameters. Significant differences for all important traits; yield (4064.7-6141.5 kg ha(-1)), protein content (10.63-13.18%), gluten content (28.97-37.43%) and gluten index (54.50-94.00%) were found. High and positive correlations were observed between protein content and some other quality traits (ash, falling number, gluten, sedimentation and modified sedimentation). Tosunbey was the best variety with high yield and quality parameters.Öğe Nitrogen and fungicide applications against Erysiphe cruciferarum affect quality components of oilseed rape(Springer, 2008) Mert-Turk, Figen; Gul, M. Kemal; Egesel, Cem O.Oilseed rape (Brassica napus L.) is one of the most important oilseed crops in temperate climates. Erysiphe cruciferarum is an important disease of oilseed rape and causes crop loss in warmer areas of Europe. The research investigated the effect of nitrogen fertilizer and fungicidal treatment against powdery mildew infection caused by E. cruciferarum of oilseed rape on seed components, including protein, oil, oleic acid, linolenic acid and undesirable substances such as sinapic acid esters (SAE) and glucosinolates (GSL), using near infrared spectroscopy (NIRS). Five susceptible oilseed rape varieties were employed in this research using four treatment groups: no nitrogen fertilization and no fungicidal treatment (N-0 - F-0); no nitrogen fertilization but fungicidal treatment (N-0 - F-1); and nitrogen fertilization but no fungicidal treatment (N-1 - F-0); nitrogen fertilization and fungicidal treatment (N-1 - F-1). Nitrogen fertilization increased the protein, but lowered the oil content, of the seeds. Fungicidal treatments significantly increased oil contents in all varieties tested, however reduced protein levels in fertilized and non-fertilized plots. The level of linolenic acid did not change significantly in any plots of any treatment combinations; a similar result was observed in the level of oleic acid in most of the genotypes. Nitrogen fertilization increased GSL and SAE levels, whereas fungicidal treatment had no effect. Our findings demonstrated that nitrogen fertilization can markedly influence some quality parameters in oilseed rape; however, the application of fungicides reduced side effects of nitrogen fertilizer and resulted a reduction on GSL, SAE and protein contents but an increase on total oil and oleic acid contents.Öğe The effect of nitrogen fertilization on tocopherols in rapeseed genotypes(Springer, 2008) Egesel, Cem Omer; Gul, M. Kemal; Kahrıman, Fatih; Ozer, Irfan; Turk, FigenTocopherols (alpha-, beta-, gamma- and delta-tocopherol) are naturally occuring antioxidants in vegetable oils. In rapeseed oil, alpha- and gamma-tocopherols are the predominant isomers, while delta-tocopherol contributes much lower amounts to the total tocopherol content. Enhanced tocopherol content in seeds appears favourable, and breeding for tocopherol content has become an increasingly important objective in winter oilseed rape. The main objectives of this research were to quantify the amount of tocopherols in a number of rapeseed varieties and to investigate the effect of nitrogen fertilization on tocopherol concentration in the seed. The field trials were carried out in 2004-2005 and 2005-2006 at Dardanos, Canakkale on the Turkish West Coast (10 km south of the city centre) with 13 varieties, three replications and three nitrogen levels (N-0: 0 kg/ha, N-1: 130 kg/ha and N-2: 260 kg/ha). The trial used a randomized complete block design with 6 m(2) plots. Tocopherol analysis was done using an HPLC system. Significant differences were found among the varieties and between the nitrogen levels. The average total tocopherol concentration was 118.7 mg kg(-1) for N-1, 134.1 mg kg(-1) for N-2 and 133.6 mg kg(-1) for N-3 fertilization level. MDS analysis indicated a rough grouping of line versus hybrid varieties and suggested that hybrids require more breeding effort to reach the level of tocopherols existed in line varieties.
