FIELD: organosilicon compounds, agriculture. SUBSTANCE: invention relates to the development of agents used for plant protection. Composition comprises at least one a biologically active substance, a solvent and polyhydroxyalkylenoorganosiloxane block-copolymer of the formula: 
at the following content of components, wt. -%: biologically active substance 10-8-5; polyhydroxyalkylenoorganosiloxane block-copolymer 0.05-60 and a solvent - the rest. Composition ensures to enhance the effect of biologically active substances used as regulators of functional state of plants, for example, as chemical agents for plant protection. EFFECT: enhanced protective effectiveness of the composition. 2 cl, 9 tbl, 9 ex
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