Parameters of spike productivity in plants varieties Novosibirskaya 67 (N67), Saratovskaya 29 (S29), Puza-4 and «many-fl wered» line Skle 123-09 were assessed in two years with different weather conditions. It was shown that «many-fl wered» line Skle 123-09 is significa tly higher in the number of grains per spike and number of grains per spikelet than varieties N67, S29 and Puza-4, and that the expression of «manyfl wering» depends on the environmental conditions and the genetic background. It was shown that the «many-fl wering» is a genetic trait and is therefore workable. A study of hybrids F 2 С29 × Skle123-09, N67 × Skle 123-09, P-4 × Skle 123-09 isolated plants with fan-shaped cones and a high number of grains per spikelet as Skle 123-09 and having the best performance of other features as ear varieties recipients. The seeds of these plants will be used to secure «fl wering». Two-factor analysis of variance showed that the number of grains per spike knotted depends on growing conditions, genotype and their interaction. Variability of grains per spikelet in drought-resistant varieties of S29 and Puza-4 is mainly dependent on the genotype and, to a lesser extent, on the «genotype × environment» interaction. In variety N67 created for West Siberia, only genotype is a factor. The weight of a grain per ear primarily is primarily affected by «genotype × environment» (almost 60 %), while the influen e of «genotype × environmental» was half as strong. The variability of «masse of one grain» in F 2 hybrids (S29, P-4 × Skle123-09) is infl enced by environmental factors, genotype and their interplay. Genotype accounts for the highest impact (> 70 %). F 2 hybrids (N67 × Skle 123-09) share the greatest variability in the «genotype × environment» interaction (77 %).
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