Agriculture and forestry

Polishchuk Mihaylo Ivanovych − сandidate of Agricultural Sciences, Associate Professor, the chief of Agriculture, Soil Science and Agrochemistry chair of Vinnytsia National Agrarian University (21, 008, Vinnytsya, 3, Solnychna St., e-mail: polishchuk.mikhaylo@ukr.net).

The paper presents the results of research on the peculiarities of growth, development and formation of elements of productivity of medium-sized varieties of potatoes Miracle, depending on the impact of biological products in foliar feeding. The use of biological products leads to a prolongation of the growing season of medium-ripe potato variety Miracle in the years of research on average by 3 - 13 days. The shortest vegetation period of 80 days is observed in the control variant (var. 1) and the longest vegetation period of 91 and 93 days was observed in experimental variants 7 and 8 where application in the germination phase and flowering phase of preparations Kristalon special and Intermag Potatoes, respectively. Morphological characteristics of the medium-ripe variety of Miracle potato increased under the influence of the applied biological products in comparison with the control variants. At the same time, the largest habit of potato plants was formed on the variants of the experiment where the application in the phase of full germination and budding phase of Crystal special and Intermag Potato was used (variants 7 and 8, respectively). The levels of yield and marketability of potatoes of medium-ripe potato varieties Miracle in the years of research were high, while the conditions in 2019 were more favorable compared to 2018 by an average of 5.3 - 7.5 t / ha. It should also be noted that the lowest values of yield and marketability of tubers were observed in the control variant where the application of background N90P90K90 was used, and the use of biological products in foliar feeding in the phases of full germination and budding led to an increase in the above indicators. The highest values of yield and marketability of tubers in the years of research were observed in options 7 and 8, where the application of Crystal special and Intermag Potato was used for foliar feeding. The level of starch content of tubers of medium-ripe varieties of potatoes Miracle in the years of research, on the contrary, reacted negatively to the use of biological products. And the collection of starch per unit area directly depends on the level of yield of potato tubers, and accordingly the highest values of starch collection per unit area were obtained in the variants of the experiment where the highest yield was obtained.

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