Pig slurry is a valuable fertiliser in potato farming, improving soil structure, nutrient supply, and crop rotation efficiency. Potatoes are highly responsive to potassium and nitrogen, both of which are present in slurry. When properly applied and incorporated, slurry enhances soil friability, water retention, and microbial activity, while reducing the need for mineral fertilisers. A farmer from the NCN project in K?dainiai (CNC) transitioned from using only mineral fertilisers to applying pig slurry before sowing rapeseed and potatoes (30 t/ha). Potatoes also receive potassium chloride, DAP, and ammonium nitrate, while cereals and rapeseed are now fertilised only with nitrogen. This shift reduced fertilisation costs and improved soil structure, making potato harvesting easier and improving tuber quality.