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  • 1 DEPARTMENT OF FIELD CROPS, FACULTY OF AGRICULTURE, THRACE UNIVERSITY, Please ask the editor of the journal.
  • 2 DEPARTMENT OF FIELD CROPS, FACULTY OF AGRICULTURE, THRACE UNIVERSITY, Please ask the editor of the journal.
  • 3 DEPARTMENT OF FIELD CROPS, FACULTY OF AGRICULTURE, THRACE UNIVERSITY, Please ask the editor of the journal.
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This research was conducted to determine the effect of genetic and phenotypic variability on the yield and yield components of some bread wheat varieties over a period of four years (1995–1998). Experiments were established according to a completely randomised block design with three replicates in the Experimental Field of Tekirda đ Agricultural Faculty, Thrace University. In the present research, genotypic and phenotypic variability, heritability and phenotypic correlation coefficients were estimated for plant height, spike length, number of spikelets per spike, number of spikes per square metre, thousand kernel weight, test weight and grain yield per hectare. The results of data analyses showed that the highest genotypic variability was obtained for per hectare yield, whereas the highest phenotypic variability values were found for plant height, thousand kernel weight and grain yield. For plant height, thousand grain yield and test weight, the broad sense heritability coefficient was found to be the highest, while it was low for spike length, number of spikelets per spike and number of Key words: bread wheat, genotypic variability, phenotypic variability, heritability coefficient, phenotypic correlation, grain yield

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