We present the results of scientific research for 2017–2021 on studying changes in the nutritive value of perennial legume-grain grass mixtures depending on the plant development phase and the number of harvests. The research method consisted of field experiments on medium-cultivated, sod-podzolic, medium loamy soil. In perennial legume-grain grass mixtures, we used single- and double-cut clover, alfalfa, meadow and reed fescue, timotheevka, bromegrass, ryegrass. We used mineral fertilizers on grass crops – diammonium phosphate at the beginning of vegetation and ammonium nitrate after the first cutting. The purpose of the research is to determine the influence of the plant development phase and the number of harvests on the nutrient content of plant matter of perennial legume-grain grass mixtures. The scientific novelty of the work consists in the fact that for the first time on the dried sod-podzolic soil the influence of plant development phases and the number of conducted harvests (three harvests) on nutrition, productivity and species composition of grass mixtures was studied. As a result of research, we have found that the content of crude protein plant raw material of the studied grass mixtures, obtained from the second and third harvests, exceeds the raw material of the first harvest by 19–25% due to an increase in the proportion of leguminous grass species in the crop. The development is intended for agricultural enterprises of all forms of ownership in the European North of the Russian Federation
Keywords
productivity, fertilizers, nutrition, grass mixture, Perennial grasses, perennial grasses, mowing