DEPENDENCE OF CROP ROTATION EFFICIENCY ON PHOSPHOGYPSE AND FERTILIZERS APPLICATION

The article is devoted to the study of the energy nutritional value of forage from perennial legumes and cereals grown on the drained lands of the Non-Chernozem zone (Tver region). The objects of research are highly productive grass stands based on variable alfalfa variety Vega 87, meadow clover variety Shans, and intensive types of cereal grasses meadow timothy variety VIK 9, meadow fescue variety Sakharovskaya. The objects of research are high-yielding grass stands based on alfalfa variety Vega 87, meadow clover variety Shans, and intensive types of cereal grasses meadow timothy variety VIK 9, meadow fescue variety Sakharovskaya.  The studies were carried out in 2018-2020 on the experimental field of the All-Russian Research Institute of Reclaimed Lands - Branch of the Federal Research Centre V.V. Dokuchaev Soil Science Institute  (VNIIMZ) on sod-podzolic light loamy soil, drained by closed pottery drainage. It is noted that under conditions of waterlogged soil and low average daily temperatures, grass mixtures of alfalfa and meadow clover with perennial grasses often have unstable productivity. The botanical composition of grass mixtures on average over the years of research showed the participation of legumes - 45-50  %, cereals - 50-55  %. Of the cereal components during the period of crop formation, more active development was noted in meadow fescue, on average, 54  % in the composition of mixtures, versus 46  % of meadow timothy. Analysis of samples of green mass and voluminous forage (silage) from alfalfa, meadow clover and cereal grasses harvested for the winter stall period showed a high protein content in silage prepared from the plant mass of alfalfa-clover-cereal grass mixture. These feeds contain protein 128.3-138.5 g per feed unit, metabolic energy 9.18-10.08 MJ per 1 kg of dry feed.