INFLUENCE OF CULTIVATION TECHNOLOGY ELEMENTS ON YIELD AND QUALITY INDICATORS OF POTATO TUBERS OF THE MIDDLE-MAPING VARIETY "BARNA" IN THE FOREST-STEPPE ZONE OF RNO-ALANIA

The results of studying the effect of microfertilizer "Ultramag Combi" and growth regulator "Regoplant" on productivity and the developed system of their combined use for the production of environmentally friendly potatoes are presented. Field experiments were carried out in 2018-2020. on leached heavy loamy chernozem underlain by pebbles of the forest-steppe zone of North Ossetia-Alania. For all variants of treatment with the growth regulator "Regoplant" and the microfertilizer "Ultramag Combi", an increase in the yield of tubers was obtained. The maximum potato yield was obtained when treated with a tank mix - 22.8 t/ha. The quality indicators of potato tubers (dry matter content, starch, vitamin C) improved markedly in all variants of the experiment compared to the control. The highest content of dry matter (22.6%) and starch (12.7%) was noted when using the tank mixture: Regoplant (25 ml/ha) + Ultramag Combi (0.75 l/ha). The calculation of economic efficiency showed that the costs are paid off in all variants of the experiment, however, the most profitable option turned out to be the treatment with a tank mixture: "Regoplant" (25 ml/ha) + "Ultramag Combi" (0.75 l/ha), where the profitability was 54.4% or 19% more than the control variant, and compared with II and III experimental variants - by 10.2; 7.8% more respectively.