Increasing demand for sustainable production influences efficient use of local resources in agricultural production. Both above-ground (stubble) and underground (roots) plant residues left in the field after harvesting crop are one of such sources. This study quantifies the share of nutrients (N, P, K) in plant residues after the harvest of four different oil crops (sunflower, raps, soybean, and mustard) in seven soil-climatically heterogeneous regions of Slovakia during the nine-years period. The results showed that winter rape and mustard left the most residues in the soil (more than 10 tons of dry biomass per hectare). After harvesting the sunflower, 5-10 tons of plant residues remained in the soil, and soybeans left the least residues (less than 5 t ha^-1). These data and the content of nutrients in plant residues are the base for coefficient of nutritional potential calculation by polynomial regression, i.e. the amount of nutrients that remains after harvesting per one ton of the main product. These coefficients and the known yield of the given crop allow us to calculate how much nutrient will leave each crop in the soil after its harvest. The results showed that the amount of remaining nitrogen in plant residues ranges from 91 to 132 kg, phosphorus from 14 to 22 kg and potassium from 72 to 218 kg per hectare. The above-mentioned fact must be considered when calculating the need for fertilizers for the following crop, to reduce the risk of environmental pollution, especially regarding nitrogen.