TY JOUR TI SPRING BARLEY CROP FORMATION USING MINERAL FERTILIZERS AND HYDROSORBENT ON GRAY FOREST SOILS OF THE REPUBLIC OF TATARSTAN KW spring barley (Hordeum sativum L.) KW leaf area KW mineral fertilizers KW hydrosorbent KW yield JO Vestnik of Kazan State Agrarian University AU Amirov, M.F. AU Suleymanov, R.R. AU Serzhanov, I.. AU Shaykhutdinov, F.. AU Semenov, P.G. PY 2025 IS 20 PB Kazan state agrarian University