Yielding ability of different types of maize hybrids

The aim of the research was to find out whether registered hybrids have the best formula or not. The experimental material consisted of four commercial hybrids: BLASK, GROM, WIARUS and WILGA, and 17 experimental hybrids obtained from the same or related lines. The material was divided into the following groups: 1) SC hybrids: BLASK, and GROM and 7 related hybrids, 2) TC hybrids: WIARUS and 8 related hybrids, 3) TC hybrid WILGA and 2 related hybrids. In the first group one experimental hybrid yielded the same as BLASK, while four other hybrids yielded as well as GROM. In the second group the experimental hybrids did not differ significantly in yield compared to WIARUS. in the third group WILGA appeared to have the optimal formula.