| Popis: |
Variability of length of spike was studied in four wheat genotypes: G-3052, G-3625, G-3004 and G-3617, grown over two years under four nitrogen nutrition treatments: 0, 30, 60 and 90kg N ha-1. The experiment was set up as a randomised block design in four replications. Differences in average values of length of spike among tested cultivars were determined in both years and under all variant of nitrogen fertilization. On average, for all genotypes, length of spike increased with increasing nitrogen rate in both years, it mean that phenotypic variability of length of spike was affected by nitrogen nutrition. In average for all cultivars length of spike was higher in the first year than in second year of experiment. The wheat genotypes G-3617 expressed highest length of spike (9.24cm) in average in the first experimental year while the wheat G-3625 had the least lowest (7.74cm) in average second experimental year. Spike length expression also highly depended to genetic factors (38.97%), but on this trait expression the environmental factors had higher influence (56.99%). |
