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Varieties of buckwheat included in the State Register of plant varieties are evaluated on yield in the irrigated conditions of southern Steppes of Ukraine. Duration of vegetation at the summer sow varied from 66 days in varieties of determynant type Yvanna, Yuvileyna 100, Sumchanka et al. to 80-82 days in more late ripening varieties of common type Stepova, Ukrainka, Oranta etc. The most yielding were Stepova, Ukrainka, Oranta, Antaryya, Yvanna and Yuvileyna 100. Among them, the most sustainable yield by research years showed Antaryya and Ukrainka. The varieties Yvanna and Yuvileyna 100 were the most yielding in the years when second half of vegetation period was comparatively more cold with the high rain quantity. For growing buckwheat at summer sowing in rice irrigated systems of South Ukraine, there are recommended the varieties Stepova, Ukrainka and Oranta.