The aim of this study was to determine the effect of mixed multi-component fertilizers on spring wheat yield, the content and uptake of macronutrients. A three-year field experiment (2005–2007) was carried out in a randomized block design at the Research and Experimental Station in Tomaszkowo, at the University of Warmia and Mazury in Olsztyn. The experiment comprised three fertilization treatments in four replications: control treatment (simple fertilizers), Amofosmag 3 and Amofosmag 4. The tested crop was spring barley cv. Orthega. Amofosmag 4 had the most beneficial influence on the yield of spring barley grain. The effect of Amofosmag 3 was similar to that of simple fertilizers. In most cases, simple and multi-component fertilizers exerted a comparable effect on the mineral composition of the tested crop. More pronounced differences were observed in this respect between successive years of the study. The highest total uptake of nitrogen and potassium by spring barley was noted in plots fertilized with Amofosmag 3, while the highest total uptake of phosphorus, calcium and magnesium was observed in treatments with Amofosmag 4. This indicates that the nutrients contained in mixed fertilizers are more readily available to plants, compared with simple fertilizers.
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