COMPARATIVE EFFECTIVENESS OF ORGANIC FERTILIZERS AND GROWTH PROMOTERS ON POTATO GROWTH, DEVELOPMENT AND TUBERING

The article presents the results of field experimental studies of changes in growth, development, phenological stages, intensity of tuber accumulation and yield under the influence of different timings of application of biohumus, supercompost and growth stimulants, bioliquid and free fulvic acid. The study's findings showed that a fractional application of biohumus and supercompost (via seeding and via nutrition) to potato crops grown on the soils of the river valleys of the Sevan basin has a more beneficial effect on their growth, development, and accumulation of tubers than a single application of these quantities (via seeding). During the fertilizing potato fields, it is necessary to apply biohumus to the soil at the rate of 8 t/ha or 10 t/ha of supercompost (60% through sowing, 40% through nutrition in the bud formation phase) and during the growing season, apply external-root feeding by bioliquid (in the bud formation and flowering phases). As a result, the highquality potato crop will be provided (390-400 c/ha), which in its turn will contribute to the improvement of the ecological conditions of Lake Sevan.