The research was carried out in south-eastern Poland in the years 2002-2005. The effect of three ways of soil mulching on the yielding of headed white cabbage ‘Masada F1’ was examined. The effects of mulching were compared with farmyard manure fertilization (40 t ha-1) and the control without mulching. As mulch the intercrops at phacelia, spring vetch, serradella, oat and rye straw were used at the dose of 5 t ha-1. The green manure was ploughed in autumn or spring, or left as a cover without being ploughed. It was found that leaving intercrops in winter period as a mulch and ploughing them under in spring had a favourable influence on the yielding of cabbage. Ploughing the intercrops and straw in autumn and leaving them as a cover without ploughing caused similar yield-forming effect. It was found that each kind of cover used in the experiments caused a significant increase of cabbage yields as compared to the control without mulching. The results of using of cover crops were similar to the effect of farmyard manure fertilization, however, they appeared in different degree in particular years of study. In the dry year 2003 the best cover crops were oat and serradella, whereas in the cool and more wet year 2004 phacelia and spring vetch were the best. In the weather conditions of 2005, the marketable yield of cabbage cultivated after intercrops, straw, farmyard manure and on the control without cover was similar and did not differ significantly.