Abstract
. In studies on soddy-podzolic sandy loamy soil of the experimental field of All-Russian Research Institute of Organic Fertilizers and Peat - a branch of the Federal State Budgetary Scientific Insti-tution "Verkhnevolzhsky Federal Agrarian Scientific Center" during 2009-2013. the possibility of using nitrogen from annual leguminous plants for feeding perennial grasses (meadow timothy grass) by using them as cover crops has been established. They, by increasing the content of as-similable forms of nitrogen and other nutrients in the soil, had a positive effect on the develop-ment of grasses in the autumn and spring periods, the formation of their biomass during the grow-ing season, improving its quality, increasing the development of the root system of perennial grasses and the accumulation of nutrients in it. The effective effect of cover crops was traced for 4 years, the total increase in hay crop during this time amounted to more than 120 c/ha, the econom-ic effect was about 17 thousand rubles.
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