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This paper deals with lagged effects of winter catch crops on the growth, yield, and quality of onion. Each autumn for two consecutive years (2009 and 2010), hairy vetch (VV), white clover (TR), winter rye (SC), Italian ryegrass (LM), and winter turnip rape (BRT) were sown as winter catch crops. In the next two springs (2010 and 2011) they were ploughed into the soil, and after them sweet corn was...