EFFICIENCY OF GROWTH REGULATORS AS FACTOR OF INCREASE IN PRODUCTIVITY AND QUALITY OF POTATOES IN CONDITIONS OF CLOSED SOIL
The article is devoted to the study of plant growth regulators of a new generation with a multifunctional effect that can simultaneously stimulate growth, development and increase the adaptive properties to adverse environmental factors, and in the future to influence the resistance of potatoes to diseases, showing a pronounced antifungal, antibacterial activity and providing protection against viruses and viroids. The effect of growth stimulants (HB-101, Phytosporin-M) on the productivity and quality of micro-plants of potato varieties of mid-early group of ripeness of Gala (foreign selection), propagated by microchipping in vitro and cultivated in protected soil (greenhouse) was studied in the experiment. The first spraying with these growth regulators was carried out in the budding phase, the next two at intervals of 7 days. The use of growth regulators on potatoes contributed to an increase in growth indicators (height and number of stems, weight of roots), assimilation surface of leaves, photosynthesis productivity, resistance to late blight, yield. The highest yield increase was obtained on the variant with the use of NV-101. In this case, the average for 3 years, a significant increase to the control was 35,3 %. A smaller, but also reliable increase in the yield was obtained on the version with the use of Phytosporin-M (16 %). The maximum increase in resistance to late blight was provided by the growth regulator with biofungicidal activity of Phytosporin-M (51.0-72.0 %). The results obtained allow us to consider promising the use of growth regulator HB-101 and Phytosporin-M. Thus, the use of growth regulators in the initial stages of the original seed – promising agrotechnical technique, which allows to obtain a high yield and ensure environmental safety of this technology.