Dubovik O. Optimization of elements of the technology in spring barley growing under north-eastern Forest-steppe conditions of Ukraine.

Object: processes of growth, development and productivity formation of spring barley varieties depending on elements of technology cultivation. Aim: to elaborate of cultivation elements of spring barley varieties on the base of influence determination of agrothecnical, meteorology, biological factors. Methods: laboratory, field, mathematic-statistical. Novelty: it was established the adaptability and plasticity of spring barley varieties to cultivation conditions, formation of photosynthesis parameters of crops, optimum rates of fertilizers, rates of planting, utilization coefficients of main elements of mineral nutrition. Results: grain yields were - 3.64, 3.50 and 3.41 t/ha (Gelios, Svyatogor, Ksanadu varieties). Coefficients of energy efficiency were 2.96, 2.54 and 2.80, net income - 1022, 857 and 728 uah/ha and profitability level - 28, 23 and 20%. The coefficient of power efficiency - 2.96, 2.54, 2.80. Application stage: the results of researches implemented in farms of Sumy region to the total area of 120 ha, which provided for an increase in grain yield 0.3-0.7 t/ha. Application area: agricultural enterprises of all ownership forms