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Articles by Ali Ozturk
Total Records ( 4 ) for Ali Ozturk
  Ozcan Caglar , Sancar Bulut , Mehmet Murat Karaoglu , Halis Gurbuz Kotancilar and Ali Ozturk
  Researches on wheat mostly focus on growth and yield rather than quality characteristics. Beside the yield, quality parameters are also affected by genotypes, climate conditions, fertilizer applications, sowing times and sowing rates. This study was performed by using facultative Kirik wheat variety under the dryland conditions of Erzurum (Turkey) during the 2002-03 and 2003-04 seasons. Quality parameters were investigated with regard to three different sowing times [winter sowing (first week of September), freezing sowing (last week of October) and spring sowing (last week of April)] and seven different sowing rates (325, 375, 425, 475, 525, 575 and 625 seeds m-2). Effects of sowing times on flour ash content were found to be significant. Although, early sowing times (winter sowing and freezing sowing) increased flour yield, the latest sowing time (spring sowing) had the highest values for the other parameters (sedimentation volume, wet gluten content and dry gluten content). Seeding rates had significant impacts on entire parameters. However, effect of sowing times and seeding rates over investigated parameters were not stable with regard to years and exhibited variations with years. While the seeding rate of 325 seeds m-2 was found to be suitable for flour yield, 525-625 seeds m-2 like dense seeding rates had better values with regard to other parameters (sedimentation volume, wet gluten content, dry gluten content and flour ash content). Grain moisture contents of different sowing times and rates observed in both years of the experiments were within the acceptable limits for storage. Falling numbers were found to be higher than desired values but almost optimum value was observed at spring sowing treatment of 2002-03. Results of this study revealed that the sowing time of spring sowing with seeding rates of 525 seeds m-2 or over densities was better than the other sowing periods and rates with regard to quality parameters.
  Ozcan Caglar , Mehmet Murat Karaoglu , Sancar Bulut , Halis Gurbuz Kotancilar and Ali Ozturk
  Beside their high grain yields, bread wheat varieties should have proper quality characteristics desired by different consumer groups. In this study, some quality characteristics (grain moisture content, flour yield, flour ash content, falling number, wet gluten content and sedimentation volume) of 25 bread wheat varieties taken for adaptation experiments under Erzurum conditions during the crop years of 2001-02 and 2002-03 were investigated. With regard to investigated characteristics, significant differences (p<0.01) were observed among varieties and year x variety interactions were also found to be significant. It was concluded in this research with regard to yields obtained from adaptation experiments and quality characteristics obtained from this study that the variety Turkmen with facultative characteristic and white grains could be recommended for this region.
  Ozcan Caglar , Ali Ozturk , Murat Aydin and Sinan Bayram
  The drought stress in one of the most significant environmental stress limiting the plant production over the agricultural lands of the world. Since, the stress caused by the pesticide paraquat (1, 1-dimenthyl-4, 4 bipyridilium dichloride) is similar to water stress which decreases the chlorophyll content of the leaves, paraquat tolerance is successfully used to determine the wheat genotypes resistant to drought. This study was carried to determine the Paraquat (PQ) tolerance of 64 bread wheat genotypes. The parameters of SPAD values before and after paraquat treatments, chlorophyll loss caused by paraquat and correspondingly calculated Paraquat Sensitivity Indexes (PSI) was investigated in this study. Significant differences were observed among the wheat genotypes with regard to all of the investigated parameters. SPAD values of genotypes before PQ treatment varied between 33.6-51.3 and varied between 28.8-47.0 after PQ treatment. Chlorophyll loss of genotypes due to PQ treatments was between 2.0-23.3%. PSI values of genotypes were found to be between 0.18-2.10. The varieties Cetinel, 2000, Alparslan, Sultan 95, Karahan and KirmiziYerli were found to be the most tolerant and Ankara 093/44, Ak 702, Haymana 79 and Conkesme varieties were found to be the most sensitive genotypes.
  Ercan Ozgan and Ali Ozturk
  In this study, compression strength and physical properties of the forty concrete carrot specimens taken from some buildings which collapsed by 1999 earthquakes were investigated and the correlations between compressive strength and physical properties determined. Compressive strength prediction models were established according to the physically properties of the specimens. These models tried to maximize using Genetic Algorithm (GA) and Linear Programming (LP) depending on specimens’ properties, ultrasound values, Schmidt hammer’s values and one-axis compressive strength. LP and GA were applied in order to maximize the carrot specimens’ compressive strength and optimum properties determined. Finally, it was seen that one-axis compressive strength of the forty carrot specimens were changing between 8-15 kPa. However, maximized one-axis compressive strength were calculated 14.97 kPa with LP and 15.27 kPa with GA.
 
 
 
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