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This study has been aimed to determine degree of weediness, grain yield and yield components of winter barley, as affected by fertilization system and liming. For that reason, the field trial with three fertilization variants and four barley cultivars was carried out during 2009, in the Center for Agricultural and Technological Research at Zaječar. First fertilization variant included NPK nutrients (120:80:53), in the second one phosphorus amount was doubled, and in the third one were applied 5 t ha' 1 of lime fertilizer "Njival Ca" and 20 t ha' 1 of manure together with mineral fertilizers. The following four winter barley cultivars were involved in the trial: Jagodinac, Record, Premium and Crystal. The trial was set on vertisol soil type, in random complete block design with three replications. This study results show that the highest weediness degree (3.8) was observed at the control variant (without fertilization), while it was lower at the fertilized variants. The highest average grain yield (4340 kg ha'1) was reached at the variant with manure, NPK and lime fertilizers, and the lowest one (3303 kg ha'1) at the first variant. Similarly, the greatest 1000 grain mass and hectoliter mass were also observed at the variant where NPK fertilizer, lime fertilizer and manure were applied. Application of fertilizers with increased amount of phosphorus, as well as lime and manure combination, significantly decreased degree of weediness and increased grain yield of winter barley.