The grain of winter rye (Secale cereale L.) originated from a field experiment conducted in the years 2011–2013 at the Didactic-Experimental Centre of the University of Warmia and Mazury inTomaszkowo (53⁰72 N; 20⁰42 E) in Poland. The aim of the study was to determine the yield of winterrye and its components and the content of proteins, starch and selected mineral components (P, K,Ca, Mg, Cu, Fe, Zn, Mn) in grain under the conditions of NPK fertilization and foliar feeding with micronutrients applied separately or in combination. Fertilization with mineral fertilizers (NPK) andwith mineral fertilizers with micronutrients applied separately or in combination resulted ina significant increase in grain yield, as compared to the plot with no fertilization. Fertilization with mineral fertilizers and foliar feeding with micronutrients (except for Cu) increased protein content inrye grain. Foliar application of nitrogen of basic fertilization with copper increased the concentrationof starch in the grain. The mineral fertilization (NPK) with micronutrients applied in combination(NPK+Cu, Zn, Mn) increased the content of phosphorus (as compared to the plot with no fertilizationand fertilized with mineral fertilizers NPK) and potassium (as compared to the NPK plot).Supplementation of basic fertilization with zinc or manganese or a combination of micronutrients resulted in an increase in Mn content in the grain as compared to the plot with no fertilization and ascompared to the plot fertilized with mineral fertilizers
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