Утицај године и генотипа на корелације између особина силажног кукуруза

Abstract

The aim of the present study was to evaluate of genetic and phenotypic correlations of traits (grain yield, number of rows per ear, height plant, height ear, length of ear, dry matter of ear and dry maty!r of plant) of twenty genotypes of silage maize: variability of inbred linfs and their diallel hybrids, superior-parent heterosis and correlations coefficient between traits. According to obtained results of the two-year study it can be concluded that variability of traits is significantly affected by a genotype, year and their interaction. As expected, hybrids had higher average values of traits than inbreds due to the depression of these traits that occur in inbreds during inbreeding. The investigation was carried out in Maize Research Institute during 2002 and 2003. years. Estimated values of coefficient of correlations were high and significant. They are mostly changed under years and genotypes influence. General Changes of correlation coefficient could not be predicted in time. The obtained data indicate that year and genotype had effect on changes of correlation coefficient. The maximum of the correlation coefficient depends from the traits, yea.rs and genotypes and interval of variation is -0.380 (between dry matter of plants and length of ear) to 1.000 (dry matter of ear and height of ear; dry matter of ear and length of ear).