POTENTIAL ENERGY ASSESSMENT IN LOCAL VARIETIES,PROMISING BREEDING LINES, REGENERANTS AND WILD PLANTS OF ALFALFA UNDER CONDITIONS OF THE MIDDLE LENA VALLEY
The paper provides the major results of the study of energy potential in local varieties, promising breeding lines, regenerants and wild plants of alfalfa growing under conditions of the middle reaches of the Lena River. For the first time, the assessment of balance ofgross energy intake, accumulation and consumption in alfalfa allowed revealing the effect of anthropogenic factors on sun light consumption rates, as well as the significance of energy potentialfor gross energy accumulation in terms of agro-energy efficiency. Gross energy content in alfalfa roots was close to that in the aboveground part. The maximal gross energy fixation in roots was 84.6 GJ/ha at root mass productivity 45.2 dt/ha and root/shoot gross energy ratio 1.08. This ratio states the balanced processes of new growth, dieback and decomposition of roots in alfalfa regenerant R 72. Nutritional value is expressed as the units of metabolic energy, this is the physiologically useful part of gross energy. Metabolic energy (ME, MJ/kg) content in 1 kg of alfalfa dry mass was 9.56 to 9.91 MJ/kg.