The aim of the research was determination of the relationship between agrotechnical factors and the yield of winter malting barley cv. Corbie. Grain yield and its components were discussed. The source of results was field experiment carried out at the Experimental Station „Bałcyny Sp. z o.o.” near Ostróda, under favourable weather conditions for winter barley in the years 2006-2008. 3^5-2(IV) fractional design was applied in two replications with 27 combinations in each one, in which at the same time 5 factors were tested (A, B, C, D, E) on three levels (0, 1, 2). Very high, though diversified in years, yield of winter barley cv Corbie was confirmed on the soil of the good wheat complex. During studies, the plants of this cultivar overwintered well, to a slight degree they lodged, and their infection with fungal diseases was low. Relationship between the yield and technological level was smaller than assumed in the working hypothesis. The highest grain yield was obtained from barley which was sown earliest (September 9-11^th), at a rate of 450 grains·m^-2 with spring N fertilization at a rate of 60 kg N·ha^-1. These were treatments protected with a dressing and 2 fungicide treatments at the time of growing and treated with regulator Retar 480 SL.

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