Abstract
The results of field studies of the effectiveness of growth regulators Epin-Extra and Agat-25 Super in meadow-chernozem soil conditions of Penza region are presented. It is established that growth regulators play an important role in the passage of development phases and contribute to the physiological activity of the most important processes in topinambur plants. The research on studying the peculiarities of plant formation and yield of topinambour of the Skorospelka variety during tuber treatment, foliar treatment, complex treatment of tubers and double foliar treatment of plants with growth regulators Epin-Extra, Agat-25 Super was carried out. The growth regulators and their application according to the experiment scheme improved the indices of topinambur tuber yield structure and green mass in relation to the control. It was found that topinambur had the following indicators: plant height varied between 165-187.6 cm, the largest mass of the above-ground part was 1237.1 grams, the tuber yield was 26 t/ha. When forming high tuber yield, there is a direct correlation between the use of growth regulators and the method of treatment, and as a consequence of their effect on the growth and development of plants in general.
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