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grains per spike and spikelet as well as grain weight have increased considerably (Table 3). For example,the number of grains per spike in Mironovskaya 61 and Mironovskaya 27 was 35.9-36.6, which is 7.7-10.0grains higher than in Ukrainka 246. The Increase in tillenng ability. spike fertility and grain weight per spikeresulted in Increased grain weight per unit area. In varieties Mironovskaya 28 and Mironovskaya 27, it waspractically twice as high as In Ukrainka. i.e., five-year averages were 693 and 754 g/m 2 respectively ascompared to 394 g/m 2 .Based on the results presented here a general conclusion can be drawn that through breeding wesucceeded in increasing yielding potential of cultivars in the 70s by 0.75-1.52 tlha (22.4-45.5%) and in the80s, by 0.52-0.97 tlha. In comparison with Ukralnka 246, yield potential increased by 3.1 tlha or 90%. Theaverage yield increase per stage of breeding was 34%. Yield increase occurred due to increased number ofproductive tillers (32.8-35.8%), grain weight per spike (21.3-21.4%) and 1000 grain weight (9.4-21.3%).ReferencesAustin, A.B., Ford. M.A.. and Morgan. C.L. 1989. Genetic improvement in the yield of winter wheat: a furtherevaluation, J. Agr. Sc. (London) 112(3):295-301.Balla Laslo. 1983. Results and tasks of wheat breeding in Hungary. Breeding and Genetics 4:47-48 (inRussian).Duvlck. D.N. 1986. Plant breeding: past achievements and expectations for the future. Ecan. Bot. 40(3):289­297.Scheffer. K., Karpenstein, M., and Stulpnagel, R. 1985. Anbauvergleich zwischen alten and neuenWinterwelzensorten bei unterschiedlicher Anbauintensitat. 1. Ertrage und Ertragsstruktur. Kali-Briefe(Buntehof) (Hannover) 17(10):749-756.52