GROWING LATER MAIZE HYBRIDS WESTWARD IN CROATIA

Hibridi OSSK 373, OSSK 444, OSSK 494 i OSSK 552 različitih grupa zriobe (FAO grupe 350, 450, 490 i 590) uzgajani su na jedanaest lokacija kroz pet godina (1999.-2003.) u makropokusima od Račinovaca (okolica Županje) do Luke (okolica Varaždina). Eksperimentalna parcela sastojala se od osam redova dužine 100 metara. Parcela je obrana kombajnom, izmjerena je vlaga zrna i utvrđena masa zrna s parcele preračunata u t/ha. Trofaktorijalnom analizom pokusa utvrđen je vrlo značajan utjecaj (F-test) sva tri promatrana činitelja: lokaliteta, godine proizvodnje i hibrida na prinos i vlagu zrna. Urod zrna bio je značajno veći kod kasnijih hibrida, a najveći prinos imao je hibrid OSSK 552 (12.16 t/ha). Trend porasta vlage zrna kasnijih hibrida na zapadnijem području bio je značajan, ali apsolutne vrijednosti vlage zrna ipak nisu bile ekstremne (ispod 29%). Uzevši u obzir potencijal rodnosti kasnijih hibrida kukuruza kao i njihovu moguću (pre)namjenu (berba u klipu i/ili proizvodnja silaže) postoji osnova za povećanje zastupljenosti kasnijih hibrida kukuruza na sjetvenim površinama sjeverozapadne Hrvatske.The hybrids OSSK 373, OSSK 444, OSSK 494, OSSK 552 of different FAO maturity groups (FAO groups 350, 450, 490 and 590 respectively) were grown at eleven locations in five years (1999-2003) in macro trials from Račinovci (near Županja) to Luka (near Varaždin). There was an experimental plot of eight rows 100 metar long. Entire plots were machine harvested and the whole quantity of grain was weighed, calculated in t/ha and grain water content was determined. In combined ANOVA, all three effects: location, year and hybrid, were highly significant (F-tast) for two agronomic traits, grain yield and grain water content. Grain yield was significantly higher in later hybrids and OSSK 552 was highest yielding hybrid with 12.16 t/ha. Going westward, water content increased more rapidly in later hybrids, but the magnitude of water content was not excessive (below 29%). Taking higher yield potential of later hybrids into account, as well as possible switching of type of production (grain and/or forage production), it is feasible to increase production of later hybrids in North-West Croatia