Purpose. To carry out an analysis of the ecological plasticity and stability of the characteristics of productivity, starch content, dry matter and to determine the parameters of ecological adaptability of potato varieties based on the characteristic “yield” in the soil-climatic zones of the Forest-Steppe and Polissia. Methods. The following methods were used in the research: laboratory, computational and statistical; to draw conclusions – analysis and synthesis. Results. The results of the analysis of potato varieties grown in different soil and climatic zones of Ukraine in terms of yield, starch and dry matter content are given. Promising varieties for selection and practical use with high indicators of adaptability, stability and plasticity were identified. It was found that the highest productivity results were obtained for the variety ‘RANOMI’ in the Forest-Steppe and Polissia zones – 34.6; 28.2 t/ha and high adaptability potential – 1.28; 1.27. The varieties ‘RANOMI’, ‘Cherie’ performed best in the Forest-Steppe zone with yields of 34.6 and 31.4 t/ha, in Polissia conditions – the varieties ‘RANOMI’, ‘PARADISO’ – 28.2 and 27.4 t/ha. The varieties with high plasticity were distinguished by starch and dry matter content (‘7 FOUR 7’, ‘PARADISO’, ‘FONTANE’, ‘RANOMI’, ‘LAUDINE’), productivity (‘7 FOUR 7’, ‘Rodriga’, ‘ALOUETTE’, ‘PARADISO’, ‘LAUDINE’). The varieties ‘Mysteriia’, ‘7 FOUR 7’, ‘LAUDINE’, ‘FONTANE’ and ‘LAUDINE’ proved to be very stable in terms of productivity and the varieties ‘Mysteriia’, ‘7 FOUR 7’, ‘Rodriga’, ‘PARADISO’, ‘RANOMI’ in terms of dry matter and starch content. The varieties with the highest productivity were ‘Rodriga’, ‘PARADISO’, and for dry matter and starch content – ‘FONTANE’, ‘LAUDINE’. Conclusions. In different soil and climatic zones, highly plastic varieties were selected according to yield index – ‘7 FOUR 7’, ‘Rodriga’, ‘ALOUETTE’, ‘PARADISO’, ‘LAUDINE’, according to starch and dry matter content – varieties ‘7 FOR 7’, ‘PARADISO’, ‘FONTANE’, ‘RANOMI’, ‘LAUDINE’. It was found that on average for 2019–2020 the highest productivity and high adaptive potential in the Forest-Steppe and Polissia zones had the variety ‘RANOMI’ – 34.6; 28.2 t/ha, respectively, CA – 1.28; 1.27. In the Forest-Steppe zone it is worth mentioning the varieties ‘Cherie’, ‘Rodriga’ with average CA index 1.15; 1.12 and productivity – 31.4; 30.62 t/ha, in the Polissia zone – ‘PARADISO’, ‘Rodriga’ with CA value – 1.20; 1.11 and productivity – 27.4; 25.5 t/ha.

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The modern economic challenges in Ukraine's agriculture are unreasonably impulse producers to search energy-saving crop production system. Unstable pricesfor the crop production andcon-stant price increasing for technological resources cause change same elements of the crop production systems and theirs whole. A reserve in this direction can be only a transition to new principles of cultivation, which provides a positive economic effect on the background of the

The research of the influence of teff flour on the technological process and quality of wheat bread was present in the article. The analysis of the chemical composition of teff flour indicated, that it is a valuable raw material for enriching wheat bread. However, its dosage in the quantity of 10 and 20 % to the weight of wheat flour leads to decrease in the amount, springy and extensibility of gluten in the dough. Alveograph studies also confirmed that dosage of 20 % of teff flour the most decreases springy of the dough and it becomes more plastic. The improvement of the structural and mechanical parameters of bread with teff was applied the biotechnological method of preparation on sourdough that created on the pure cultures of lactic acid bacteria “Biolight”. The experimental studies were proving that utilizing of teff flour in the quantity of 10 % and sourdough improved both the quality and nutritional value of wheat bread. In particular, the specific volume of bread increased by 4.0 %, acidity ‒ by 2.9 % compared to the control; and the product was distinguished by a pleasant "nutty" taste and aroma. Close correlations between the percentage of teff addition and the spread of the dough ball were established, r=0.98 (n=10, p≤0.05) and the form stability of the bread, r=(‒0.95) (n=10, p≤0.05). It allowed establish that wheat bread with teff addition need to make in the mould. It was calculating that consumption of the daily norm of bread with 10% teff the consumer will be receiving a sufficient quantity of valuable food nutrients. Thus, the need of protein was covered by 42.9 and 49.8 %; iron ‒ by 32.3 and 28.5 %; vitamin B5 ‒ by 17.6 and 24.2 %, respectively, for men and women; and the need for phosphorus ‒ by 26.7 %, for both groups. The technology of wheat bread with teff of high quality for mass consumption that recommended for wide industrial implementation has been develop