In Magadan region for the development of animal husbandry it is necessary to strengthen the feed base on the basis of the expanded use of species and varieties of perennial grasses in grass sowing, which have high phytocenotic resistance and yield, long productive longevity and high adaptive ability to the natural and climatic conditions of the North-East with the production of stable high-protein feed with low cost. To solve this problem, the experimental field of the Magadan Research Institute of Agriculture has been conducting research since 2018 in order to identify, study and determine the parameters of the criteria for selecting economically valuable samples of forage grasses: Arctagrostis latifolia, Beckmannia syzigachne (Steudel) Fern.,Alopecurus arundinaceus Poir. (ventricosus Pers.). The listed varieties of forage grasses were marked out from the natural flora of the Far East north for further use in breeding work as a new source material. In the course of the study, a positive correlation between abiotic factors (the sum of active temperatures, soil moisture, precipitation during the growing season) and the duration of the growing season of perennial grasses (r = 0.89-0.92) was established. The high variability of a number of phenotypic characteristics of native grasses that determine forage productivity was determined: the number of generative (V=34-52 %) and vegetative (42-87 %) sprouts per bush, the average weight of 1 sprout (34-52 %), the height of the vegetative layer in the tillering stage (11-59 %) and in the mass heading stage (16-35 %), the length of 2 and 3 leaves (17-39 and 78-123 % respectively). The analysis of the conjugation of the main economically important features and properties was carried out, which allowed us to establish reliable high correlations of the yield of green and dry mass with various elements of the feed productivity structure in breeding samples of perennial grasses in the conditions of Magadan region.

Fandeeva Ya. D., Fedosova N. V.

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