Productive longevity of perennial cereal grasses under conditions of frozen soils of Nurbinsk ulus of the Republic of Sakhа (Yakutia)

The research objective was studying the dependence of long term fodder and seed efficiency of perennial grasses on variety features on permafrost soils of Privilyuysk zone. The research problems were to define long term fodder and seed efficiency of the varieties of Bromus inermis, Festuca rubra, Psathyrostachys juncea; to study winter hardiness of varieties of Bromus inermis, Festuca rubra, Psathyrostachys juncea. The objects of the research were the varieties of three species of perennial grasses: Bromus inermis (Kamalinsky 14, Ammachaan, Haptagaysky), Festuca rubra (Myuryunskaya, Ensieli) and Psathyrostachys juncea (Bootur, Ietteen, Manchaara). The seeding of experimental grasses was carried out on June 15, 2009. Agrochemical indicators of the soil of an arable layer of the plot were рН -7.8-7.9; N content - 1.04-3.46; PO - 13.1-13.7; KO - 13.8-31.0 mg / 100; the maintenance of humus - 2.6-3.4 %. The predecessor was bare fallow. The accounts and supervision of the solution of the research problems were made according to standard techniques...