TY JOUR TI Phytomelatonin – as an element for increasing the efficiency of spring wheat in the dry conditions of the Middle Volga region KW melatonin KW spring wheat KW concentration KW germination KW yield KW quality JO INTERNATIONAL AGRICULTURAL JOURNAL AU Shapoval, O.A. AU Mukhina, M.T. AU Borovik, R.A. AU Mozharova, I.P. PY 2025 IS 0 PB Electronic science