Evaluation of growthstimulating activity of substances contained in bark-containing wastewater from woodworking industry

The possibility of using an aqueous extract of bark-containing mass of wastewater formed during wood processing as growth stimulator for various crops was considered. The proposed technological solution meets the modern requirements to improve the environmental efficiency of enterprises in woodworking industry, contributes to the expansion of the range of goods which can be used in related industries, including the agroindustrial complex to increase its productivity. Studies on testing extractive substances of bark-containing mass at various dilutions as a growth stimulant for a number of test crops (spring common wheat cv. Rada and garden cress cv. Azhur) were carried out. The cambium layer of wood contains all the necessary substances required for higher plants and is most susceptible to destruction under the influence of water and mechanical forces during wood processing at the stage of bark separation. In this regard, the possibility of using aqueous extracts from the bark of various wood species as growth stimulants was investigated. The purpose of the research was to study the effect of a complex of bark extractives on biometric parameters of the test crops depending on the dilution factor of the concentrated bark-containing wastewater from wood processing. It was established that specially prepared aqueous extracts from the bark have pronounced growth-s timulating effects (significant increase in root length by 3540 % and sprouts - by more than 4244 %) and can be used as growth stimulants in seed preparation. The method of producing growth stimulants based on bark-containing wastewater is protected by a patent.