The genetic purity and homogeneity of seed are essential prerequisites for achieving the expected agronomic performance of hybrids and ensuring high yield potential. The aim of the present study was to evaluate five maize hybrids (K1–K5) with respect to the homogeneity of their seed lots originating from different certified seed batches. The assessment of homogeneity (varietal purity) was carried out based on the evaluation of morphological and phenological traits, following the requirements of the official control protocol (small-plot post-control variety testing). The experiment was conducted in 2025 at the Variety Post Control Station of NÉBIH, where off-type plants (differing in phenological and/or morphological traits) were identified during the growing season using official variety descriptions. Based on the obtained results, the homogeneity of the examined hybrids was consistently high, well above the official threshold value. No statistically significant differences were detected among the hybrids (p = 0.259); however, graphical analyses revealed minor variability among individual seed lots. All examined samples met the varietal purity requirements specified in the current standards.
The results indicate that even under high average homogeneity, subtle differences among seed lots can be detected, which may serve as important indicators of hybrid genetic stability and seed production quality.