TY JOUR TI STRUCTURAL AND AGGREGATE SOIL COMPOSITION UNDER PERENNIAL GRASSES IN DARK CHESTNUT SOIL UNDER THE REPUBLIC OF TYVA CONDITIONS KW perennial grasses KW structure KW dark chestnut soil KW agronomically valuable fractions KW structural coefficient. JO Bulletin of KSAU AU Mongush, L.T. PY 2021 IS 0 PB Krasnoyarsk State Agrarian University