Yielding of naked and hulled varieties of spring barley in variable nitrogen fertilization

The field research was carried out in years 2001-2002 at an individual farm in Krajew-ie-Budzi?ach (Podlasie province). The studies determined the relation between the yields of grain in the two forms of varieties of spring (naked - Rastik, hulled - Stratus) barley cultivated under conditions of varied nitrogen fertilization (0, 30, 60, 90, 120 kg N·ha-1). The research showed that agroclimatic conditions in the studied years of the Podlasie province had impact on the spring barley yield. The highest yields of grain were obtained under conditions of good soil moisture, significantly lower under the shortage of falls. The naked variety Rastik was not competitive in the yielding to the hulled variety Stratus. Nitrogen fertilization significantly diversify the yields of spring barley corn. The naked variety Rastik showed a significant reaction in the yields of grain up to the dose 60 kg N?ha-1, and hulled variety Stratus only up to the dose 30 kg N?ha-1. The yields of grain were determined by the number of panicles on a unit of the area, the number of grains in the ear and by the mass of 1000 grains. A significant influence was exerted by the varieties and nitro-gen fertilization. The lower yield level of Rastik variety as compared to the hulled variety Stratus resulted from the smaller density on the field, the smaller number of grains in the ear and the smaller mass of 1000 grains. The highest 1 kg N net productiveness was obtained after the applica-tion of a lower level of the nitrogen fertilization. A higher doses of nitrogen fertilization caused declined productiveness; however, it was still relatively high. A higher efficiency of nitrogen utilization was characteristic of the hulled variety Stratus.