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Articles by Omer Caliskan
Total Records ( 2 ) for Omer Caliskan
  Cuneyt Cirak , Ali Kemal Ayan , Kudret Kevseroglu and Omer Caliskan
  In a previous study, we found that Hypericum perforatum seeds exhibit both exogenous and endogenous dormancy and the seeds needed light for germination strictly. In this study, the effect of light was studied more deeply. For this, seeds were exposed to different light intensities (0, 600, 1200, 1800 and 2400 lux) for 6, 12, 18 and 24 h a day. According to the results, the effect of light intensities was more evident and 2102.5 lux light intensity with any exposure times evaluated in this study except for 6 h a day was found to be the most suitable treatment for breaking endogenous dormancy.
  Kudret Kevseroglu , Sezgin Uzun and Omer Caliskan
  In this study, the possibility of prediction of germination percentage and days to germination of the seeds for some industrial plants; sunflower (Helianthus annus L.), soybean (Glycine max L.), pappy (Papaver somniferum L.), fenugreek (Trigonella foenum L.), nigella (Nigella sativa L.) and castor oil (Ricunus comminus L.) by mathematical models based on temperature was investigated. For this reason, a model (D=a-b*T+c*T2) produced earlier for predicting the time to emergence in relation to temperature for some vegetable crops was utilised. The final structure of the model did not change for predicting the days to germination of the tried industry plants while it changed to (D=a+b*T-c*T2) for predicting germination percentage (GP) of the crops tried. It was found that the new mathematical models obtained after adapting the present data to the above-mentioned model could be used safely in terms of the studied parameters. In addition, optimum temperatures (To=b/2*c) for seed germination in the tried crops were calculated by using the coefficients obtained from the produced regression models of the days to germination.
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