The genotype, environment and their interaction play an important role in the grain yielding and grain
quality attributes. The main aim of this study was to determine the contributions of the genotype,
environment and their interaction to the variation in bread-making traits. The data that were used for
the analyses performed in this study were obtained from 3 locations in Poland from post-registration
multi-environment trials with winter wheat in 2009 and 2010. The experimental factors were the
cultivar (7 cultivars) and the crop management level (low input and high input). In the multienvironment
trials, 17 traits were investigated that characterize grain, flour and dough quality. Most of
the traits were affected much more strongly by environmental factors (i.e., year and location) than by
genotype. The variance components revealed an especially strong effect of the year on the baking score,
loaf volume and water absorption, as well a strong effect of the location on dough development and
protein content. The obtained results demonstrate that the grain quality as measured by the parameters
based on the protein content and quality may be substantially improved by crop management practices,
especially by N fertilization level.