Field experiment was carried out in the Didactic and Experimental Department in Swadzim (52^o26’ N; 16^o45’ E) near Poznań in years 2004-2007. The experiment was carried out in „split-plot” design with 3 factors in 4 field replications. Reactions of two maize hybrid types to differentiated nitrogen and magnesium fertilization and to the method of magnesium dose application were studied. The effect of the investigated factors was estimated on the basis of the changes in the morphological features of plants and ears and on the quantitative status of plants. The hybrid LG 2244 stay-green type has shown a better qualitative status of plants than the Anjou 258 hybrid. LG 2244 hybrid produced lower plants; its production ears were set lower. It developed a smaller assimilation surface area of a single plant and of the ear leaf. Its ear diameter was smaller and the ears were longer in comparison with the hybrid Anjou 258. A significant effect of the size of the nitrogen dose was found to be exerted on the changes in the values of morphological features in plants and ears. The size of magnesium dose and the broadcasting method modified the height at which production ears were set on the plant, independently of the hybrid type and the size of nitrogen fertilization.

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