Voloshchuk V. Biologoecological Features and Cultivation Technology Elements of Helianthus tuberosus L. × Helianthus annuus L. Hybrid Under Conditions of Right Bank Polissya of Ukraine

It was found that the most intensive development of Helianthus tuberosus L. × Helianthus annuus L. plants are observed with mineral fertilizers application at the rate of N120P120K120 and planting scheme 70×20 cm. The vegetation period of plants under these conditions is the shortest and is 158±3 days. Proved, that during Helianthus tuberosus L. × Helianthus annuus L. planting period in the third decade of April and according to the scheme of 70×50 cm with mineral fertilizer application in the dose N120P120K120 provides maximum growth of plants in the flowering phase. Plants height under these conditions averages 347 cm, the number of internodes – 44.0 pcs., leaves number – 46.0 pcs., and stem diameter – 29.0 mm.Established, that the highest profitability of aboveground phytomass (84 %) can be obtained by planting scheme 70*20 cm and application of mineral fertilizer in the dose of N120P120K120, in the control (without fertilizers) – 78 %. For the ethanol production from tubers in such variants, this figure is 146 %, in the control (without fertilizers) the level of profitability is significantly lower (129 %). Based on the analysis of energy efficiency of Helianthus tuberosus L. Helianthus annuus L. growing technology, explored, that the energy efficiency coefficient varies depending on the planting schemes and different fertilizer rates application. The highest energy efficiency coefficient (8.03) was observed for planting scheme 70×20 cm and application of mineral fertilizer at the rate of N120P120K120. In control (without fertilizers), this figure is significantly lower (7.58).