EN
In three-year field and laboratory trials carried out in: Olsztyn, Lublin and Warsaw the relations between the level of nitrogen application and yield as well as technological parameters of rye grain of open-pollinated (Amilo) and hybrid (Esprit) cultivars were studied. When grown on good rye soil the hybrid gave a yield higher by 20% as compared to the open-pollinaled cultivar. The yield of cv. Esprit increased with N application rate up to 119 kg N•ha-1 whereas for Amilo up to the rate of 130 kg N ha-1. From the ANOVA it can be concluded that interaction of nitrogen level with cultivar was insignificant. The margin effectiveness of 1 kg of nitrogen in the interval of highest nitrogen rates amounted to 12.3 kg and 3 kg of grain per 1 kg of applied nitrogen for Espirit and Amilo, respectively. Grain of both cultivars showed high values of all flour and bread parameters determined The same effects of nitrogen application on flour and bread parameters were found for both cultivars under study. The increase of nitrogen level resulted in the decrease of grain uniformity, increase of energy consumption of grain milling, reduction of Hour output and increase of protein content in the grain. The most pronounced reduction of bread parameters was found for rates higher than 60-90 kg Nha-1.