OPTIMIZATION OF ALLELOPATHIC AND MICROBIOLOGICAL STATE OF CITRUS LIMON (L.) BURM. PLANTS ROOT ENVIRONMENT UNDER GREENHOUSE CONDITIONS

To preserve gene pool of valuable introduced plants the effect siliceous mixture on allelopathic and microbiological characteristics of lemon ( Citrus limon (L.) Burm.) root environment was studied. Siliceous mixture was added into soil under Genoa cultivar Citrus limon perennial plantations of citrus plants collection of the M.M. Gryshko National Botanical Gardens of NAS of Ukraine in greenhouse conditions. The positive effect of siliceous mixture on soil microbiota of lemon trees was found. Siliceous mixture application led to an increase in the number of investigated ecological trophic groups of microorganisms, except micromycetes, in the soil under Citrus limon plants in all terms of observation. Intensification of organic matter transformation contributed to the reduce the rate of the accumulation of phenolic allelochemicals mobile forms, which can decrease the productivity of plants, in the Citrus limon root environment. Using a siliceous mixture optimized redox and allelopathic state of soil under perennial Citrus limon plants. The efficiency of the siliceous mixture generally was raised with increasing time after its application.