The effect of organic extracts on the microelements content in selected species of forage grasses
The aim of the study was to determine the effect of soil fertilising biopreparations, i.e.compost extract, vermicompost extract and humus extract, used against the background of NPK mineral fertilisation, on the content of manganese, iron, zinc and copper in the biomass of Lolium perenne, Festulolium braunii, and Dactylis glomerata.In the spring of