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Yield and yield paramaters of maize (Zea mays L.) genotypes in irrigated and N fertilized conditions

Field experiments were set up at Agricultural Institute Osijek (Croatia) as split split-plot method with three repetitions thru two growing seasons (2008-2009). Soil type at trial field is classified as eutric cambisol, non calcareous. Soil retention water capacity was close to the value of FWC (36.6% volume). Aim of this research was to determine the influence of irrigation, nitrogen rate, and maize genotype on yield and yield parameters of maize (cob length, cob weight, grain number per cob, grain weight per cob, and number of rows per cob). Irrigation (A) as main factor had treatments as follows: A1-control treatment, A2-soil water content from 60% to 100% field water capacity (FWC), A3-80% to 100% FWC. Nitrogen fertilization was sub factor (B1- control treatment, B2-100 kg N ha-1, B3-200 kg N ha-1) while the sub sub-factor (C) was maize genotype (hybrids FAO group 500 and 600). Irrigation treatment resulted by statistically significant increasing in grain yield 8 159 kg ha-1 (A1) to 9 097 kg ha-1 (A3) in year 2008 and 9 788 kg ha-1 (A1) to 10 315 kg ha-1 (A3) in year 2009. N fertilizers have significantly increased yield 7 689 kg ha-1 (B1) to 9 336 kg ha-1 (B3) in 2008 and from 9 318 kg ha-1 (B1) to 11 119 kg ha-1 (B3) in year 2009. Grain yield significantly varied thru tested genotypes from 8 336 kg ha-1 (C3) to 9 137 kg ha-1 (C4) and from 9 831 kg ha-1 (C1) to 10 704 kg ha-1 (C3) in years 2008 and 2009. Treatments resulted with significant differences in yield parameters.

irrigation ; N fertilization ; maize hybrids ; yield ; yield parameters

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