A three-year-lasting field experiment involved investigation on the effect of nitrogen and boron fertilization: 80, 120, 160 kg N∙ha-1; 80 N + 2 kg B, 120 N + B, 160 N + B kg∙ha-1 on fat and protein yield, as well as energy value of spring rape seeds. The experiment was conducted on brown and grey-brown podsolic soil of slight acidity. The experiment followed a „split-plot” method, with two variables introduced. The first examined factor was the population cultivars Heros and Hunter and hybrid cultivar Jura. The second factor was nitrogen and boron fertilization. Different humidity conditions in the years of the experiment had a significant effect on the protein and fat yield, as well as energy value of seeds. In 2005 the protein yield obtained from 1 area unit was higher by 32% as compared to 2006 and 2007. In 2005 the obtained fat yield was higher by 209 kg from 1 ha in comparison to the most disadvantageous year 2006. These differences ranged more there 30%. Double - improved cultivar feature were obtained such as considerably higher protein yield (by 29%) and fat (by about 35%) and energy value (by 30%) as compared to crossbreed compound. Fertilization with the dose of 160 kg N∙ha-1, combined with boron, enabled obtaining protein yield per 1 ha higher by about 3% in comparison to the lowest N dose (80 kg N∙ha-1). Average protein and fat yield, at combined nitrogen and boron fertilization, increased by 1.3% and 1.6% respectively. Considering the interaction of the examined factors (cultivar x fertilization) the most advantageous effect of the fertilization dose 160 kg N∙ha-1 + B on crude fat and total protein yield, as well as grain yield and energy value occurred in the case of the population cultivar Heros in comparison to the hybrid cultivar Jura.
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