Scientific Journal of KubSAU

In this article, we present the results of the experiments on the potential of productivity and accumulation of the root mass of the Alfalfa and Brome-grass, on the content of the main nourishment elements and the consolidation of gross energy in the roots and agroenergetical effect of the collected gross energy in the conditions of permafrost turf soil of the Middle Lena valley. The maximum productivity potential of beans and cereals grass mixture was reached on the basis of the organic mineral nourishment regime: the collected exchange energy – 21,3 GJ, feed units – 1568 and collected raw proteins – 428 kg per ha. Thus, the content of digestible protein in beans and cereals grass mixture agrophytocenoenosis was increased from 118 to 124 g, that exceeded a zootechnic norm (105 g). In general the nitrogen contained in the total root mass of beans and cereals grass mixture agrophytocenoenosis was up to 26,6 centner per hectare and movable phosphorus- up to 33,6 kg per hectare that can serve as the source of nourishment for sown herbs. The maximal stock of gross energy in roots was got in beans and cereals grass mixture agrophytocenoenosis at organic-mineral degrees (humus of 40 centner per hectare once in 4 years + of N120PK60 annually) up to 157,1 GJ/ha, while the accumulation of the root mass reached 140,3 centner per hectare at average annual rates of accumulation of dry substance up to 24,5 centner per hectare. The processes of formation, decomposition and death of roots in the beans and cereals grass mixture agrophytocenosis take place almost in a balance state. Wherein the biological factor, as the inclusion of the Yakut yellow variety of the Alfalfa in the grass stand, plays a positive role

For the first time results of researches on potential productivity and environmental role of hayfields in the Indigirka river basin (Momskiy district) are presented. Researches proved that feeding meadow plants in conditions of the Indigirka river basin, depending on the type of vegetation, location and features of root systems, provide maximum crop productivity – up to 18,5 dt/ha of hay with productivity of 1 ha for harvesting exchange energy up to 16,1 gigajoule, fodder units 1130 and crude protein up to 209 kg maximal underground mass accumulation of meadow plants was formatted in the region of Indigirka and Khonuu – mixed and squirreltail barley (hordeum jubatum) hayfield up to 193,6 dt/ha, dry matter and carex duriuscula and squirreltail barley hayfield up to 252,2 dt/ha with the majority of roots in layer 0-10 cm. up to 76-88%. Field of Khonuu, with mixed and squirreltail barley hayfield, contained underground nitrogen – up to 33 kg/ha and labile phosphorus – up to 71 kg/ha. Increased accumulation of labile phosphorus root mass provides enhancement of cold resistance ability in conditions of the subarctic zones of Yakutia