EN
The research was carried out in the years 1994 - 1995 in the apple orchard, growing on brown earth, of a grey-brown type (Orthic Luvisol), derived from silt formations, non-uniform on chalk marl. The orchard has been the object of fertilizing experiments of the Fruit-Growing Department of the Academy of Agriculture in Lublin. The following objects were selected for the analysis: AH - fertilization with the dose of 525 kg of NPK ha⁻¹, herbicide fallow strip; AM - fertilization with the dose of 525 kg of NPK ha⁻¹; KH - control, without mineral fertilization, herbicide fallow strip; KM - control, without mineral fertilization, grass strip. High mineral fertilization increased the acidification of soil in comparison to non-fertilized plots. The highest decrease in pH was noted at the fertilization onto herbicide fallow strips. The highest decrease in soil pH resulted in the strong depression of the biochemical activity i. e. dyhydrogenases. phosphatases and urease activities of the soil in that combination.