The aim of the study was to determine the influence of nitrogen fertilization on the development of the chemical composition of the post-harvest residue of non-papilionaceous plants cultivated in stubble intercrop. Field experiment was carried out in years 2002-2004 at the University of Technology and Life Sciences Research Station at Mochełek (53^o13’ N; 17^o51’ E) on very good rye complex soil. In the post-harvest residue of oilseed radish, a significantly higher concentration of macronutrients (N, P, K and Mg) was found than in tansy phacelia and sunflower. Nitrogen content in post-harvest residue increased together with the increase in its dose used in fertilizers. Especially effective in this respect was the increase in the nitrogen dose from 45 to 90 kg·ha^-1. Phacelia reacted the strongest by the increase in the nitrogen content in the post-harvest residue, and also in other macronutrients (P, K, and Ca) as the nitrogen dose increased.

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