The 1998-2001 study evaluated the productivity of spring barley, over selected development stages, cultivated in various crop rotations and in monoculture. It was shown that dry matter yields of overground plant parts and roots were over each development stage significantly higher in crop rotations than in monoculture. The share of roots in the total dry matter of barley was highest over full tillering to opening of leaf sheaths. The cultivation of spring barley in monoculture significantly increased the occurrence of take-all disease as compared with crop rotations with a 25 and 50% share of spring barley. All that decreased the ear density, grain weight per ear and 1000 grain weight and, as a result, decreased the field productivity.

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