Andreychenko O. Agrotechnical measures of increase of yield of chaffy and hulless spring barley in the northern Steppe of Ukraine

The object of the research – the growth, development and formation of productivity of plants of chaffy and hulless spring barley under the influence of mineral fertilizers, biologics, micronutrients and growth regulators. The purpose and tasks of the research – to develop new and improve existing agro-technical measures of cultivation of chaffy and hulless spring barley through the integrated application of biologics, micronutrients, growth regulators and establish the most economically appropriate doses of mineral fertilizers depending on the predecessor (soybean, winter wheat, sunflower) on the ordinary black earth soils of the northern Steppe of Ukraine. The methods of the research: field experiments, visual and measuring-weight method, laboratory, mathematical-statistical, comparative calculation. The results: there were established and recommended to the production the optimal parameters of the elements of the technology of growing of chaffy and hulless spring barley. There were published the scientific and practical recommendations for the northern Steppe of Ukraine "Bioadaptive technology of growing of seed of spring barley". There were defined the most economic appropriate doses of mineral fertilizers in growing of modern varieties of spring barley after the predecessors soybean, winter wheat and sunflower. It was recommended the inoculation of seed of chaffy spring barley by the biologic Polimiksobakteryn (150 ml per 1 hectare of seeding rate) in combination with the microfertilizer Reakom (4 l/t) and the seed of hulless spring barley to process by the biologic Diazofit (200 ml per 1 hectare of seeding rate) and to spray the crops with the growth regulating substance (GRS) Biosyl 10 ml/ha. Novelty – for the first time in conditions of unstable humidity of the northern Steppe there were established the patterns of growth and development of plants, the formation of productive haulm stand, yield and quality of grain of modern varieties of chaffy spring barley (variety Statok) and hulless (variety Gatunok). There were intensified the scientific understanding about the effectiveness of use of mineral fertilizers and the proved the expediency of complex use of biologics, micronutrients and growth regulators, determined their impact on the increase of productivity of spring barley. The degree of implementation – the production test and implementation of the results of the researches were done in SE "EF" Elitne " of the KSAES of the NAAS, farm "Agro-Vladimir" of Malovyskovskiy district, SE" EF "Chervoniy zemlerob" of the KSAES of the NAAS, SE "EF "Stavydlyanske" of Alexandrovskiy district, PE "Syniukha" of Novoarkhangelskiy district and other farms of Kirovograd region on area of over than 1000 hectares. Branch – agriculture.