Grain yield of maize is mostly affected by amount of available water and nitrogen and correlated to yield components. In this 2-years study the influence of different irrigation water amounts (a1=rainfed; a2=60-100% field water capacity (FWC); a3=80-100% FWC), nitrogen fertilizer levels (b1=0 kg*N*ha -1 ; b2=100 kg*N*ha -1 ; b3=200 kg*N*ha -1 ) and hybrids (c1=OSSK515; c2=OS5997; c3=OS5775; c4=OS5885) on grain yield and yield components was tested. Furthermore the correlation analysis as well as direct and indirect path coefficients were used to analyse the connection between yield and yield components (grain number/cob, grain weight, 1000 grain weight, cob length, cob weight) across tested treatments. The influence of all tested factors was significant (P<0.05) in both years of study. Specific study results were obtained in extremely wet year 2010 when irrigation water reduced grain yield and yield components (a1=9.9; a2=8.8; a3=7.8 t*ha -1 ). Opposite to year 2013 when irrigation water increased grain yield as well as yield components (a1=8.9; a2=9.7; a3=10.3 t*ha -1 ). Nitrogen fertilizer was significant to all tested variables in both years of the study (b1=5.7; b2=9.2; b3=11.7 t*ha -1 in 2010 and b1=6.3; b2=8.9; b3=10.6 t*ha -1 in 2013). Generally, the greatest amount of nitrogen fertilizer the larger yield or yield components are achieved. The influence of hybrid was significant for all tested variables with exemption to 1000 grain weight and grain weight/cob during growing season 2013. In both years of the study hybrid c2 OS5997 achieved the highest yield as well as yield components. Correlation analysis showed strong positive correlation between yield and cob weight (r=0.77 (2010) SažetakUrod zrna kukuruza varira u odnosu na količinu pristupačne vode i dušika te o komponentama uroda. Cilj ovoga rada bio je proučiti utjecaj različitih tretmana navodnjavanja (a1= bez navodnjavanja; a2=60-100% poljskog vodnog kapaciteta (PVK); a3=80-100% PVK), gnojidbe dušikom (b1=0 kg*N*ha-1; b2=100 kg*N*ha -1 ; b3=200 kg*N*ha -1 ) te hibrida (c1=OSSK515; c2=OS5997; c3=OS5775; c4=OS5885) na urod zrna i komponente uroda. Nadalje proučiti korelacijsku povezanost između uroda i komponenti uroda (mase zrna/klipu, apsolutna masa, broj zrna/klipu, dužina klipa, masa klipa). Svi čimbenici u istraživanju značajno (P<0.05) su utjecali na ispitivana svojstva u obje godine istraživanja. Tijekom ekstremno vlažne 2010. godine navodnjavanje je neočekivano snizilo urod zrna na oba tretmana navodnjavanja (a1=9.9; a2=8.8; a3=7.8 t*ha -1 ) dok je tijekom vegetacije 2013. godine urod zrna povećan na oba tretmana navodnjavanja (a1=8.9; a2=9.7; a3=10.3 t*ha -1 ). Gnojidba dušikom povećala je urod zrna na oba gojidbena tretmana i obje godine (b1= 5.7; b2=9.2; b3=11.7 t*ha -1 u 2010. i b1=6.3; b2=8.9; b3=10.6 t*ha -1 u 2013. godini). U pravilu urod zrna jednako kao i komponente uroda rastao je povećanjem količine dodanoga gnojiva. Hibrid je značajno utjecao na sva ispitivana svojstva s izuzetkom apsolunte mase i mase zrna/klipu tijekom ...

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During the 3‐year study, maize (Zea mays L.) production in the eastern Republic of Croatia suffered great losses due to periods of flood (2010) and drought (2011 and 2012). An excessive amount of water as well as lack of it caused variation of yield and efficiency of irrigation scheduling. Irrigation treatments included a rainfed treatment and irrigation up to soil water content 80–100% of field capacity. The nitrogen fertilization treatments were 0 (control) and 200 kg N ha−1. The analysed crop productivity parameters were 1000‐grain mass and grain yield, in two hybrids. The irrigation significantly increased maize grain yield in dry years, while in the extremely wet year of 2010 yield in the irrigated plot was reduced doe to stress caused by excessive rainfall and over‐irrigation. Both tested hybrids responded positively to the combination of nitrogen fertilizer and irrigation. Regardless of whether expressed on a fresh tissue or dry weight basis, the proline content in maize leaf did not show a clear effect of irrigation treatment, whereas nitrogen fertilization stimulated this amino acid accumulation. There was a close relationship established between proline in leaf dry matter in both growth stages and 1000‐grain mass, as well as a weak relationship between this parameter at flowering and final grain yield. Copyright © 2017 John Wiley & Sons, Ltd.

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