Abstract
In home gardens and in production plantations a number of varieties of walnut (Juglans regia L.) are cultivated in Poland. During the growing seasons trees emit semiochemicals including volatile and non-volatile secondary metabolites. They mostly include phenolic compounds, flavonoids, naphthoquinones and terpenes. In the literature of the subject there are only some scarce data on the role of these metabolites in environmental interactions. Therefore, the aim of this study was to study the impact of the soil environment of walnut on soil microorganisms. The soil microbial isolation studies were carried out on selective microbiological media (Czapek-Dox agar, Sabouraud’s agar with chloramfenikol, nutritional agar). The obtained results showed that metabolites from the walnut which get through to the soil can influence the level of microorganisms in the soil, maintaining the level of bacteria at a constant number and successively reducing the number of fungi.
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