The possibility of using digestate from 3 biogas plants as fertilizer and soil improver was investigated on the areas of 6 farms. 4 variants of fertilization were compared: fertilization with solid and liquid digestate, fertilization with only mineral fertilizer and control without fertilization. In crop rotation were grown: corn, winter wheat and It. ryegrass. The properties of the digestate, the physical and chemical characteristics of the soil, the yield and chemical composition of the plant material and the economic profitability of the fertilization variants were determined. It was established that solid and liquid digestate contain plant nutrients and organic matter and can be used as a substitute for mineral fertilizers in the fertilization of agricultural crops. The content of heavy metals above the max. permissible values was not determined in any digestate sample. Both types of digestate show a trend of a positive effect on the physical properties of the soil, but the solid digestate seems to be more effective in most aspects. With digestate, it was found that water retention in the soil is slightly better. Fertilization of the same surface with liquid and solid digestate did not increase the content of heavy metals in the soil. The yields of corn for silage, corn kernels and wheat kernels obtained when fertilizing with solid or liquid digestate mostly did not differ significantly from the yields obtained with fertilization with only mineral fertilizer. The content of heavy metals in corn for silage, corn grain, winter wheat grain and It. ryegrass hay from areas fertilized with digestates did not differ significantly. By comparing production costs and income, fertilization with liquid digestate is more profitable.