The paper presents the results of research concerning the influence of various methods of set-aside on the weed infestation of winter triticale on the light soil. In 2007-2010 the experiments were carried out in the Experimental Station in Bezek (east Lublin Region) on the podsolic soil, formed from heavy loamy sand. Triticale was sown after one-year land lying fallow, in which 5 various ways of its cultivation were used: bare fallow (mechanical), mechanical and herbicide fallow, herbicide fallow, hay-growing fallow and green fodder fallow. Roundup 360 SL was used in chemical cultivation. The range of research comprised the follow-up influence of set-aside on crop weed infestation. The infestation was defined by quantitative and weight method before triticale harvest. It was stated that the biggest number of weeds per 1 m² and their air-dry mass were observed in winter triticale sowing after hay-growing fallow. Herbicide as well as mechanical and herbicide fallow land reduced the number of perennial weeds in winter triticale canopy. The dominant species in canopy of winter triticale were monocotyledonous species, especially Apera spica-venti, Setaria pumila and Elymus repens.

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