EN
The field experiments, which were the base of the study, were conducted by Exp. Agric. Station at Swadzim near Poznan, in 1986-1991. The effect of nitrogen rates, on concentration of total N and nitrate N, in indicator parts of plant, was investigated. Nitrogen fertilizers were applied from 0 to 270 kg N/ha, with split every 30 kg. Nitrogen fertilization caused an essential increase of content of total N and nitrate N, in whole overground parts of plants and in ribs of bottom leaves, in stages of 3-4 leaves, in beginning of tassels flowering and full maturity of grain. The relation between content of both study nitrogen forms and nitrogen rates, in whole plants and in indicator part, are described by power function.