Research was conducted over 2000-2002 at the Brody Experimental Station of the Poznań Agricultural University to investigate the effect of long-term organic and mineral fertilization on the yield of spring barley in monoculture. The yield of spring barley grown in monoculture was 24% lower than that in crop rotation. The highest yield was obtained after a combined organic and mineral fertilization. The continuous cropping of spring barley led to an increased weed infestation and stem base diseases infection. Farmyard manure was the main factor which caused changes in chemical properties of soil, including soil reaction, organic C, total N, available P, K and Mg contents.

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