TY JOUR TI THE IMPACT OF LUCERNE’S NEW BREEDS ON THE STRUCTURE OF ARABLE LAYER OF HEAVY-GREY FOREST SOILS DEPENDING ON MINERAL NUTRITION LEVEL KW alfalfa varieties KW soil structure KW the ratio of structure KW water-stable aggregates KW gray forest soil. JO Vestnik of Kazan State Agrarian University AU Sharipova, G.. AU Tagirov, M.S. AU Shaytanov, O.. PY 2015 IS 10 PB Kazan state agrarian University