Abstract

The effect of organic fertilizers Bio-Mare grades Bio-Fish and Bio-Algo from sea hydrobionts on different backgrounds of mineral nutrition was studied, effective terms and methods of their application were determined, providing increased yields, reduced morbidity and mineral nutrition in potato cultivation. Researchers have shown expediency of use of preparation Bio-Fish and Bio-Algo in the integrated system of potato protection from Rhizoctonia solani J. G. Kuhn. Double treatment of plants or a combination of pre-planting treatment of tubers and spraying of plants with the preparation of Bio-Fish contributed to the reduction of rhizoctoniosis development before potato harvesting by 13.2 % and the disease prevalence by 40.0%. The maximum reduction of rhizoctoniosis development by 13.9 % and the disease prevalence by 44.8 % in these variants was also obtained with Bio-Algo. Due to the use of Bio-Algo on the background of (NPK)90 and (NPK)60, the content of vitamin C in potato tubers increased by 4.66 %. The maximum yield of potatoes (26.6 t/ha) was obtained by treatment of tubers in combination with spraying of plants with Bio-Algo on the background of (NPK)90i.e. equal to the yield of potatoes on the background of (NPK)120 in economic control, which makes it possible to reduce the dose of mineral nutrition of potato by 30 per cent.