Phosphorus, potassium, and pH values in the grassland soils and the recommendations for the improvement of soil nutrient content in the Pomurje region

For the sake of an analysis of phosphorus, potassium, and soil pH values in the air-dried soil samples, 1,350 grassland soil samples were examined for the period from 2009 to 2014, and 550 soil samples were examined for the period from 2015 to 2019. In both studied periods, the phosphorus content averagely ranged between 10.14 and 11.17 mg P2O5 /100 g or reached the B level of supply, according to Mirko Leskošek’s (1993) recommendations. In the first period studied, the potassium content in the soil reached an average of 15.86 mg K2O/ 100 g of soil and an average of 15.37 mg K2O/ 100 g of soil in the second period studied, having reached the B level of supply. During the periods studied, the pH value reached a value of an explicitly acidic reaction, or an average pH value of 5. Based on the results obtained, general recommendations for grassland fertilization and calcification were prepared.