ABSTRACTŁukowiak R., Barłóg P., Grzebisz W. (2017): Soil mineral nitrogen and the rating of CaCl 2 extractable nutrients. Plant Soil Environ., 63: 177-183.It was assumed that the determination of the mineral nitrogen (N min ) content in the 0.01 mol/L CaCl 2 could rely on measurements of single form NO 3 --N, NH 4 + -N or both, and even including other extractable nutrients. This hypothesis was verified based on some primary data from 17 fields: ten with oilseed rape and seven with maize as indicatory crops during three consecutive seasons in a production farm in Górzno, Poland. The contents of NO 3 --N, NH 4 + -N, P, K, Mg and pH were measured in soil prior to the spring vegetation start and after a crop harvest (autumn). Phosphorus in spring and NH 4 + -N in autumn, were variables discriminating against the number of clusters.It was higher in cropping sequences (CSs) with maize than with oilseed rape. The reliability of N min determination and distribution between clusters in spring based only on NO 3 --N was fully corroborated for maize CSs. In autumn, irrespective of the CS, the decisive factor in N min prediction and distribution over clusters was the NH 4 + -N pool.This study resulted in the rating of CaCl 2 extractable nutrients, indicating their availability status, shortage or excess, on the background of the N min temporary rating.