DISPERSION AND REGRESSION ANALYSIS ON GRAIN YIELD AND NITROGEN FERTILIZATION OF TRITICALE VARIETIES I

The aim of the study is to analyze the responsiveness of two Bulgarian varieties of triticale to the rate of nitrogen fertilization in the formation of grain yield The study area was Field Crops Institute - Bulgaria. The test period concluded 2015/2017. Were tested two varieties - 'Colorit' and 'Respect'. Were included in the experimental production tree rates of nitrogen fertilizer (kg/ha) - N-60,N- (12)0 and N-180. The phosphorus fertilizer was 60 kg/ha. Dispersion and regression analysis was applied to establish statistically significant influences of the studied factor and differences between the tested variants. Mineral fertilization at rates of 60, 120 and 180 kg N/ha had a confirmed statistical effect. The regression equations confirmed that the nitrogen rate has a strong influence on the grain yield For both tested varieties, the largest increase in grain yield compared to the theoretical yield can be expected when fertilizing with 60 kg N/ha.