Abstract
It is known that stresses during the cultivation of agricultural plants reduce yields, and the occurrence of stressful effects leads to the release of allelotoxins by plants into the soil. It has been suggested that this factor can have a noticeable effect on the vegetation of vegetables in greenhouses, and a decrease in the concentration of allelotoxins in greenhouse substrates can improve the vegetation of plants. To verify these assumptions, the allelotoxicity of greenhouse substrates and the content of microorganisms in them under well and poorly vegetating plants of cucumbers, tomatoes and peppers were determined. It was found that there are significantly more allelotoxins and fewer prokaryotes in the substrates under poorly vegetating plants, which confirmed the assumption about the significance of the allelotoxins influence on the cultivation of vegetables in greenhouses. The introduction of humate solutions with a high sorption capacity in relation to allelotoxins into the root zone of plants makes it possible to significantly improve the vegetation of cucumbers and may be a promising direction for increasing vegetable yields in greenhouses.