TY JOUR TI OPTIMIZATION OF WINTER WHEAT NUTRITION IN THE ARID ZONE OF STAVROPOL TERRITORY KW Winter wheat KW agrochemicals KW potassium humate "Souffleur" KW Polidon Bio Profi KW yield KW mineral fertilizers KW quality KW crop structure JO INTERNATIONAL AGRICULTURAL JOURNAL AU Gromova, N.V. AU Bevololova, A.A. AU Lobankova, O.Y. AU Ustimenko, E.A. PY 2025 IS 8 PB Electronic science