Didora V. Agrobiological foundations of growing fiber-flax in Ukrainian Polissya.

Production process of fiber flax growth and development. The purpose of work - on the basis of the determination of regularities of fiber flax daily growth and development periodicity and photosynthetic activity to develop the agrobiological principles of highly efficient fiber flax growingtechnology. The research methods are generally accepted,physiological, analytical, agrochemical, biochemical and statistical. The regularities of flax plant growth and development with the use of field auxanography method and the determination of the nature of circadian rhythmicity and daily periodicity depending on the abiotic factors are revealed. Due to the agrobiological substantiation the highly efficient fiber flax growing technology is developed and optimized. The developed technology is introduced at the farms of the Ukrainian Polissia zone over an area 13.2 thon ha what ensures the increase in straw yield by 32.3%, fiber one - 68.8% and the quality improvement of flax stock by two upgrading standards when r educing expenditures of energy resources by 33.4%. The field of application - agricultural production.