The aim of the study was to determine the effect of the use of soil fertilizer used against the use of mineral fertilization on the energy and protein values of Lolium multiflorum (cultivar Gaza) and to assess the usefulness of soil fertilizer UGmax for animal production. Studies with the cultivation of this species were carried out in pots, in four repetitions, on the experimental plot of the Department of Grassland and Greenland Management. In each pot, eight seeds of the tested species were sown. After germination, when seedlings reached the 2-3 leaf stage, negative selection was performed by removing four weakest plants. Then, the experimental factors were introduced in the form of the following fertilizer combinations: A1 – mineral fertilization at the annual doses of 0.6 g N·pot^-1, 0.11 g P·pot^-1, and 0.75K g·pot^-1, A2 – no fertilization, B1 – soil fertilizer in the form of 0.25% solution and the dose of 3.7 cm³·pot^-1, B2 – no soil fertilizer. Nitrogen (34% ammonium nitrate) and potassium (60% potassium salt) fertilization was used in three split doses, while phosphorus (46% triple superphosphate) in a single dose in the spring. Soil fertilizer solution was used a single time with plant watering at the shooting stage. The period of full, three-cut use of the experimental material occurred in years 2008-2010. During that period, the analysis of the chemical composition of dry matter yield, for all cuts, was performed at the Institute of Technology and Life Sciences in Falenty. Furthermore, the following measures of the energy and protein indexes of the fodder were calculated: feed units for lactation (ULF), feed units for maintenance and meat production (ULV), protein digested in the intestine on the basis of energy (PDIE) and nitrogen (PDIN), and relative feed value (RFV). Use of soil fertilizer in Italian ryegrass cultivation did not result in a clear improvement of the chemical composition of plant dry matter and energy metric values, as well as the protein value of the fodder.

65-74