THE NUTRITIONAL VALUE OF PASTURE GRASS MIXTURES DEPENDING ON THEIR SPECIES COMPOSITION IN A DRY-STEPPE ZONE OF KAZAKHSTAN

Abstract

The aim of the research is to develop methods for managing the successional processes of phytocenoses in hayfields and pastures and increasing the sustainability of their productivity, by determining the nutritional value and chemical composition of perennial grasses used in the mixture. During the research, the generally accepted methods of setting up field experiments were used in agronomy, laboratory research was carried out in an accredited laboratory according to established methods and standards on modern equipment; The objects of research are grass mixtures of perennial forage grasses and natural pastures. Results and practical significance. This article presents an analysis of the results of laboratory studies to determine the chemical composition and nutritional value of forage grasses in mixtures proposed for use in creating a succession of pastures in the drysteppe zone of Kazakhstan. The data obtained indicate the advantage of the alfalfa + awnless rump + wild rye Juncaceae grass mixture, since in terms of chemical composition and nutritional value it exceeds the others (wheatgrass + alfalfa, alfalfa + awnless rump) by 0.04 and 0.031, respectively. Thus, the proposed herbal mixture of alfalfa + awnless rump + wild rye Juncaceae has great prospects for use on pastures, and high economic efficiency of use. Also, studies of the nutritional value of grass mixtures make it possible to estimate the nutritional value of the green mass of pastures during the created succession, which will reduce the proportion of the use of concentrated feed during the stall period of animals. The novelty of the research lies in the fact that, due to the established nutritional value of the grass mixture, methods of managing the composition of phytocenoses will be developed, ensuring the maintenance of productive longevity. Scientific and practical significance of research: the developed methods of managing the composition of phytocenoses can provide savings in capital investments, in addition, the renewal of grass stands can be carried out 2-8 times less often than was previously recommended.