TY JOUR TI About the influence of solutions of fulvic acids from sapropel on lettuce plants in various types of its processing KW fulvic acid solutions KW nutrient film technique KW watercress KW lettuce KW seeds KW soaking KW non-root treatment KW introduction to the root environment KW growth KW productivity KW photosynthesis JO Agrarian Bulletin of the AU Udalova, O.R. AU Mirskaya, G.V. AU Kononchuk, P.Y. AU Panova, G.G. PY 2021 IS 209 PB Ural State Agrarian University