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For the first time in the conditions of Uzbekistan, a collection of stem varieties and hybrids was comprehensively studied and a promising starting source for selection work was allocated. Argo, Perst, Chelnok, Revansh, Otradnyy, Severyanka samples with a validity period of 93–97 days are recommended for creating early varieties. Valuable determinant (38–61 cm) for selection work – Perst, Chelnok, Severyanka, Revansh, Otradnyy, Fonarik, Argo, Alpateva 905a, Utenok, Sevara, Marjona, Bahadir and semi-determinant varieties (74–84 cm) – Surkhan 142, Volgogradsky 5/95, Taramata, Sugdiyona, Utenok varieties are separated. The highest total productivity was observed in Fonarik, Revansh, Utenok, Surkhan 142 varieties and they gave 8-31% higher yield in the first period and 8-32% in the second period compared to the comparative variety. 10 first-generation hybrids obtained based on cross-breeding of stock varieties and comprehensively evaluated.
The highest total yield in first generation hybrids G1 Surkhan 142 x Sevara, G1 Sevara x Taramata, G1 Dostlik x L–31, G1 Surkhan 142 x Marjona, G1 Surkhan 142 x L–31, G1 Dostlik x Marjona, G1 Volgogradsky 5/95 x Marjona was observed in combinations. The total productivity of these hybrids was 72.0–83.0 t/ha in the first period, and 57.2–71.6 t/ha in the second period. The effect of heterosis in these hybrids was 131–160% in the first term, and 120–163% in the second term. It was in these hybrids that the highest effect of heterosis on early yield was observed: 134–192% in the first term and 117–179% in the second term. A selection test of the promising bardam variety Bardam has been organized and it is being prepared for the State variety test and submission to the Intellectual Property Agency.