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Mean positive correlation (r = 0,47**) between grain yield and number of plants per m² and strong correlation between grain yield and number of spikes per m² were established (r = 0,55**). Weak correlation was established between grain yield and productive tillering (r = 0,24**). Strong positive correlation (r = 0,51**) is between the number of spikes per m² and productive tillering, as well as between the number of plants per m² and number of spikes per m² (r = 0,68**). Very weak negative correlation (r = -0,12*) is between productive tillering and the number of plants per m². Regression equations of grain yield and other investigated traits, on the level of significance 5% and 1%, have linear form. By increasing one plant per m², the number of spikes for one per m², productive tillering for one, grain yield will be increased for 0,006 t/ha, 0,005 t/ha and 1,174 t/ha on the average. The other regression equations between the number of spikes per m², number of plants per m² and productive tillering have linear form. By increasing one plant per m² and productive tillering for one, the increase of number of spikes per m² is 1,087 and 312,21 on the average. By increasing the number of plants per m², productive tillering is reduced for 47,59 on the average

The aim of the research in field conditions was to establish grain yield and some yield components in three wheat varieties depending on seed size, 1.8, 2.0, 2.2, 2.5 and 2.8 mm, using split-plot method in four replications. The highest number of plants (477 and 518) per m 2 was obtained from the 2.5 and 2.8 mm seed size, respectively. The largest number of spikes (561 and 532) per m 2 was obtained from the 2.8 and 2.5 mm seed size, respectively. The highest coefficient of productive tillering of 1.39 was recorded in the 1.8 mm seed size. Remaining seed fractions (2.0, 2.2, 2.5 and 2.8 mm) gave significantly lower productive tillering. There were very significant differences in wheat grain yield over years, varieties, seed sizes and the year × seed size interactions. The highest wheat grain yields of 7.22 t ha-1 and 6.86 t ha-1 were achieved in the case of 2.5 and 2.2 mm seed sizes, respectively. A positive strong correlation was detected between the number of overwintered plants and the grain yield (r = 0.63**). Moreover a positive strong correlation was established between the number of spikes and the grain yield (r = 0.70**), while the negative weak correlation was recorded between the coefficient of productive tillering and the grain yield (r =-0.32**). With the same sowing norm, a large seed produces a significantly higher number of plants and spikes per m 2 than small seed, which is important for the grain yield.

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