Summary

Maize has been growing in Croatia at 400.000 hectares annually on average which makes it the most widespread crop on arable lands in Croatia. It is base and raw material for production of wide range of different products what makes it also a strategic crop for each developing country. Choosing of proper maize hybrid for particular area is certain guarantee for not achiveing grain yield and its stability beyond a certain level. Maize breeders at Agricultural Institute Osijek have been developing breeding programes for more than fifty years including commercial hybrid testing program as well as testing of new specific combinations of inbreds in long term microtrials and many environments. The results of those trials are of the greatest importance for maize breeders because they lead to the inferences regarding advantages and disadvantages of the hybrids grown in particular environments. This paper deals with microtrials results of seven commercial hybrids across three years and three locations in Croatia as well as four new hybrids investigated at three locations in official state commitee trials in Bosnia and Hercegovina. The results proveded optimistic view concerning hybrids selection for Bosnian market from already registered hybrids in Croatia. State commitee trials results also showed significant higher yields of all the hybrids investigated in four FAO maturity groups.

          Key words: maize, grain yield, long term trials, Croatia, State commitee trials, Bosnia and Hercegovina.