The influence of green manures in form of forecrops (oat, vetch, field pea, and mixtures these of plants) and farmyard manure on crop and the content of dry matter and mineral elements in white cabbage, was examined. The highest yields of white cabbage were obtained after the ploughing the mixtures of vetch, oat and field pea and of vetch and field pea, and farmyard manure. The highest content of nitrogen was characterized by cabbage cultivated after mixture of vetch with oat and field pea, and vetch. One could notice more magnesium in cabbage cultivated after on organic fertilization than without it. Ploughing of all biomass of green manures influenced more profitably on the content of magnesium. The kind of organic fertilization did not influence the content of dry matter, phosphorus, potassium and calcium in white cabbage.

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