TY JOUR TI The influence of micro fertilizers on the photosynthetic activity of safflower in the Lower Volga region KW safflower KW photosynthesis KW leaf surface area KW yield KW micro fertilizers JO INTERNATIONAL AGRICULTURAL JOURNAL AU Sukhareva, E.P. AU Belikina, A.V. AU Solonkin, A.V. PY 2026 IS 0 PB Electronic science