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, e-mail: selection@vsau.vin.ua).

Mazur Olena Vasylivna – Candidate of Agricultural Sciences, Аssistant of the Department of Plant Growing, Breeding and Bioenergetic Cultures, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str. 3).

In article it is carried out differentiation of bean varieties on their reaction to contrast hydrothermal conditions.The adaptive genotypes are identified which have a good reaction to improving the agrophony of cultivation with high stability of the manifestation of signs with a low dispersion dispersion relative to regression.

The best responses to improving the hydrothermal regime over the length of the growing season were the variety samples: UD0300019, UD0302223, UD0302796,  while they showed high stability, since the stability variation was approaching zero. These varieties were classified in the fifth rank by the parameters of plasticity (b) and stability (S²). The greater duration of the interphase period of flowering-ripening and the lesser reaction to deterioration of agrophony conditions were characterized by variety samples: UD0302256, UD0302642, UD0302683, UD0302805.  The  highest  homoeostatiness    was     provided     by     variety   samples:  UD0302683 – 25,6; UD0302856 – 16,6;  UD0302642 – 12,4,  and  in  these varieties the stability variable (Si2) was maximally close to zero. The highest yields during the growing years were provided by variety samples: UD0302746  –  469  g/m²,  UD0302642  –  438  g m²,  UD0300565   –  434   g/m², UD0302256 – 422 g/m², UD0300658 – 411 g/m². These sorts of specimens were distinguished by a high reaction to improving the hydrothermal cultivation regime, high stability and homeostasis, which was  in  variety  samples: UD0302746-30, UD0302256 – 27,3, UD0302642 – 27,1, 

UD0300658 – 26,9, UD0300565 – 26,2. All variety samples, on coefficient of agronomical stability were stable, the coefficient of agronomical stability varied from 75,5 to 87,9%, and the coefficient of a variation changed from 12,1 to 24,5%.

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