EVALUATION OF SOME MAIZE GENOTYPES BASED ON THE TKW PARAMETER

The study made a comparative analysis between twenty maize hybrids based on a seed quality index. The corn hybrids were created within ARDS Suceava. The comparative crop of the twenty hybrids was done within ARDS Lovrin. Maize crop was organized in randomized repetitions, in a non-irrigated system. The experimental name of the hybrids was SV1 to SV20. Adequate crop technology ensured uniform vegetation conditions for the maize hybrids studied. The weight of thousand seeds (TKW) was considered as an index of seed quality. The Anova test (PHC) was applied for the comparative analysis of the twenty hybrids. 190 combinations were made in the comparative analysis. According to the recorded results, in the case of 71 comparative analyses, differences were recorded in terms of statistical safety; 31 positive differences and 40 negative differences. Compared to the mean value calculated at the experiment level (TKW = 195.95 g), 12 hybrids presented values ​​above the mean, and eight hybrids presented values ​​below the mean. Positive growth of the TKW parameter associated with the genotype potential (compared to the mean value), was between DTKW = 0.23 g (SV2) and DTKW = 33.17 g (SV13). Negative growth of the TKW parameter, associated with the potential of the hybrid, was included between DTKW = -0.90 g (SV11) and DTKW = -60.04 g (SV5). The cluster analysis facilitated the grouping of hybrids based on Euclidean distances in the cluster dendrogram (Coph.corr. = 0.837). The hybrids were grouped based on similarity, in relation to the recorded TKW values. Independent positioning was recorded in the case of the SV5 hybrid with the lowest TKW value. Subcluster C2-A contained four hybrids, with high values ​​of the TKW parameter (((SV8,SV12),SV6),SV13). Based on similarity, the other hybrids were grouped into two other subclusters (C2-B, and C2-C). The highest level of similarity was recorded between SV7 and SV15 hybrids (SDI = 0.11).