Use of a preparation containing as active ingredient (a) at least one compound of general formula wherein R 1 is hydrogen, ammonium, alkali metal cation, alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms, phenyl, phenyl substituted in positions 2, 3, 4, 5 and 6 with hydrogen, alkoxy group having 1 - 5 carbon atoms, alkyl having 1 - 5 carbon atoms in chain, halogen or hydroxy group; R 2 is hydrogen, acyl having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms; in concentration range 10 -7 to 10 -2 mol.dm -3, in combination with (b) at least one of: titanium compounds formed by reaction of titanium chloride with ascorbic acid, citric acid, malic acid, tartaric acid, succinic acid, oxalic acid, salicylic acid, ethylenediaminetetraacetic acid or amino acids; titanium chloride, titanium chloride, titanyl sulfate, TiO(NH 4) 2 (SO 4) 2, hexafluorotitanates of general formula M 2 TiF 6 wherein M is alkali metal cation, ammonium cation or tetraalkylammonium cation having 1 - 4 carbon atoms in each alkyl chain; titanium alkoxides of general formula Ti(OR 3) 4 wherein R 3 is alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms, in concentration range 10 -6 - 10 -3 mol.dm -3, and further contains suitable additives, preservatives and solvents for the induction of increased production of bioactive compounds in plants grown in soil, in synthetic substrate or in hydropony. (a) at least one compound of general formula wherein R 1 is hydrogen, ammonium, alkali metal cation, alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms, phenyl, phenyl substituted in positions 2, 3, 4, 5 and 6 with hydrogen, alkoxy group having 1 - 5 carbon atoms, alkyl having 1 - 5 carbon atoms in chain, halogen or hydroxy group; R 2 is hydrogen, acyl having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms; in concentration range 10 -7 to 10 -2 mol.dm -3, in combination with (b) at least one of: titanium compounds formed by reaction of titanium chloride with ascorbic acid, citric acid, malic acid, tartaric acid, succinic acid, oxalic acid, salicylic acid, ethylenediaminetetraacetic acid or amino acids; titanium chloride, titanium chloride, titanyl sulfate, TiO(NH 4) 2 (SO 4) 2, hexafluorotitanates of general formula M 2 TiF 6 wherein M is alkali metal cation, ammonium cation or tetraalkylammonium cation having 1 - 4 carbon atoms in each alkyl chain; titanium alkoxides of general formula Ti(OR 3) 4 wherein R 3 is alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms, in concentration range 10 -6 - 10 -3 mol.dm -3, and further contains suitable additives, preservatives and solvents for the induction of increased production of bioactive compounds in plants grown in soil, in synthetic substrate or in hydropony. titanium compounds formed by reaction of titanium chloride with ascorbic acid, citric acid, malic acid, tartaric acid, succinic acid, oxalic acid, salicylic acid, ethylenediaminetetraacetic acid or amino acids; titanium chloride, titanium chloride, titanyl sulfate, TiO(NH 4) 2 (SO 4) 2, hexafluorotitanates of general formula M 2 TiF 6 wherein M is alkali metal cation, ammonium cation or tetraalkylammonium cation having 1 - 4 carbon atoms in each alkyl chain; titanium alkoxides of general formula Ti(OR 3) 4 wherein R 3 is alkyl chain having 1 - 18 carbon atoms, alkyl chain having 1 - 18 carbon atoms ω-substituted with hydroxy, amino or sulfonic acid group, cycloalkyl having 3 - 8 carbon atoms, isoalkyl having 1 - 18 carbon atoms, in concentration range 10 -6 - 10 -3 mol.dm -3, and further contains suitable additives, preservatives and solvents for the induction of increased production of bioactive compounds in plants grown in soil, in synthetic substrate or in hydropony.