THE EFFECT OF ORGANIC FERTILIZERS AND BIOPREPARATION FLAVOBACTERIN ON POTATO YIELD AND SOIL FERTILITY

The paper presents the results of research into complex effect of organic fertilizers (decomposed cattle manure) in different doses with the biological preparation Flavobacterin on agrochemical parameters and biological activity of permafrost soils in the cultivation of the recognized potato variety Varmas. Field experiments were carried out in 2016–2018 on permafrost chernozem-meadow light-loamy saline soils of the Central Yakut lowland of the Republic of Sakha (Yakutia). The yield of potatoes increased with the application of manure in the dose of 60 t/ha and biological preparation Flavobacterin by 61.4%, control (without fertilizers) – 9.7 t/ha. In the variant: manure 40 t/ha + biopreparation Flavobacterin, the yield amounted to 13.0 t/ha; when treating with the biological preparation – 10.7 t/ha. The use of organic fertilizers in different doses in all studied variants increased the content of phosphorus, potassium and total nitrogen in the soil compared to the control. Combined application of organic fertilizers and biological preparation Flavobacterin increased the biological activity of permafrost soils by 2.9–4.7 times. The intensity of the biological activity of permafrost soils in all years of research was observed during the growing season of crops. The number of soil microorganisms reached its maximum in July and decreased at the end of the growing season (early September), due to the peculiarities of the hydrothermal regime of the soil under study. To preserve soil fertility, it is recommended to use organic fertilizers in combination with the biological preparation based on agrochemical parameters of permafrost soils.

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