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Articles by Fahrettin Tilki
Total Records ( 4 ) for Fahrettin Tilki
  Emrah Cicek and Fahrettin Tilki
  Effects of stumping back on the performance of browsed or poorly developing Fraxinus angustifolia seedlings were investigated in the present study. One year old bareroot seedlings of F. angustifolia were planted at a spacing of 2x2 m in March, 2004. Most of the growing seedlings were damaged by heavy animal browsing or grew poor in the first growing season. At the end of the first vegetation period a randomized block design with three replications were designed to evaluate the effect of stumping back on the performance of F. angustifolia seedlings. The treatments were (A) undamaged seedlings with good growth (shoot increment >20 cm) not stumped back, (B) undamaged seedlings with poor growth (shoot increment <5 cm) stumped back and (C) damaged seedlings by heavy animal browsing stumped back at 8 cm above the root collar in December 2004. Singling was done in stumped back plants in mid-May 2005 and a healthy straight stem was left. It was found that stumping back significantly increased growth of poorly developing or heavy browsed seedlings and didn’t reduce survival after two growing seasons following stumping back in December 2006.
  Emrah Cicek , Fahrettin Tilki , Semsettin Kulac , Murat Yilmaz and Faruk Yilmaz
  Seedlings of Fraxinus angustifolia Vahl., Ulmus laevis Pall. and U. minor Mill. were grown in nursery for this study. The one-year old bareroot planting stocks so produced were out-planted on the bottomland site with heavy clay soils and 360 seedlings per species was assessed two years after planting for diameter, height and survival. Significant differences were found among species in survival, diameter and height. Fraxinus angustifolia and U. laevis had excellent survival (100%) and survival was lower in U. minor (92%). Ulmus laevis had the greatest height increment (128.3 cm) and total height (187.5 cm) followed by U. minor. Fraxinus angustifolia had the lowest height increment (76.4 cm) and total height (147.2 cm). Diameter increment was also different among species and U. laevis had the greatest diameter increment (15.1 mm) and there were not significant differences among U. minor and F. angustifolia. It might be concluded that the overall survival and growth of the species were high enough on this bottomland site with heavy clay soils although there were significant differences among the species in survival and growth.
  Fahrettin Tilki
  In present study Arbutus unedo seeds were stratified at 4°C for different durations (0, 3, 6, 9 or 12 weeks), treated with gibberellic acid (GA3) (0, 300, 600, or 900 mg L-1) or treated with potassium nitrate (KNO3) (0, 0.2, or 0.4%) to break dormancy and allow germination. The pretreated seeds were germinated at 20°C under 12 h light. One additional parameter, the effect of light on seed germination was also studied and the seeds treated with 600 mg L-1 GA3 solution or stratified for 12 weeks were germinated at 20°C in the dark or 12 h light. Stratification of seeds at 4°C for 9 or 12 weeks, or treatment of seeds with 300, 600 or 900 mg L-1GA3 was successfully overcome dormancy in A. unedo seeds. Treatment of seeds with KNO3 did not increase germination and light did not play a main role in the germination.
  Emrah Cicek and Fahrettin Tilki
  In the present study, the effect of stratification on the germination of Pterocarya fraxinifolia seed was studied. Collected seeds were cold stratified without a medium at moist low temperature for 0, 3, 5 and 7 weeks at a constant temperature of 4±1°C or warm stratified for 3 weeks at 20°C for 8 h and 4°C for 16 h (20/4°C). After each stratification duration, the seeds were placed in a germination chamber at a temperature regime of 8 h at 30°C plus 16 h at 20°C (30/20) in darkness and Germination Percentages (GP) and germination rates (PV) were determined. 3, 5 or 7 weeks of cold stratification without a medium broke the seed dormancy and produced more than 90% germination. Germination rate was the highest after 5 or 7 weeks of cold stratification. The present study reveals that Pterocarya fraxinifolia has seed dormancy and 5 weeks of cold stratification without a medium is necessary to maximize seed germination percentage and germination rate.
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