EN
A series of field experiments with spring barley was carried out in several Poland’s regions under various soil conditions between 2000 and 2002. The response of the naked cultivar Rastik and two husked cultivars Rataj and Rodion to nitrogen rates (0, 30, 60 and 90 kg•ha-1) was determined. The grain yield of barley (mean of three cultivars) increased at the N rate of 60 kg•ha-1. Protein content of grain and protein yield increased at the N rate of 90 kg•ha-1. The naked cultivar (Rastik) gave lower grain yield and higher protein content of grain in comparison with the husked cultivars. Protein yield of Rastik was similar to protein yield of Rodion and lower than that of Rataj. All cultivars responded in a similar manner to the N rate of 30 kg•ha-1. Rastik cultivar showed the least response to the N rate of 60 kg•ha-1and to the N rate of 90 kg•ha-1under superior soil conditions.