Agriculture and forestry

Mazur Oleksandr Vasyliovych – Candidate of Agricultural Sciences, Associate Professor of the Department of Plant Production, Selection and Bioenergetic Cultures, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str., 3 е-mail: selection@vsau.vin.ua).

Mazur Olena Vasylivna – Candidate of Agricultural Sciences, Senior Lecturer of the Department of botany, genetics and plant protection, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str. 3).

Tymoschuk Tetyana Mykolayivna − Candidate of Agricultural Sciences, Associate Professor of the Department of Plant Protection, Polissya National University (10008, Zhytomyr, 7 Staryi Boulevard).

The varieties of beans that are the least responsive to growing conditions (primarily in terms of moisture supply) by changing the weight of 1000 grains are selected.  Coefficient of plasticity (bi <1): UD0302683, UD0302746, UD0302642, UD0303533, UD0302256.  These cultivars slightly reduced the weight of 1000 grains due to the deterioration of the moisture supply, they are drought-resistant. It should be noted that the varieties that were characterized by the maximum value of grain productivity in quantitative terms, also showed maximum variability in grain productivity over the years of research.  These are primarily varieties: UD0300565, the weight of grain from the plant which was 10.6 g, as well as UD0302642, the weight of grain from the plant was 10.5 g, UD0302746 - 11.4 g.  - 20%, and UD0302746 - 17%. Therefore, the production needs varieties of common beans that will provide stable and above average yields under adverse growing conditions, and at optimal high levels.  Therefore, varieties of common beans were distinguished, which were characterized by lower absolute values in grain productivity and higher stability of the trait during the study period.  Such cultivars included UD0303533, whose grain productivity was 8.53 g, and the regression coefficient (bi = 0.81), coefficient of variation (V = 18%), coefficient of agronomic stability (As = 82%);  UD0301899 - 7. 88 g,   regression   coefficient    (bi = 0.65),     coefficient    of    variation  (V = 15%),  coefficient of agronomic stability (As = 85%).  That is, these varieties did not respond much to the deterioration or improvement of growing conditions while maintaining stable grain productivity.  Given that the coefficient (As) exceeds 70%, the selected varieties of common beans were stable.

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