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The studies were carried out under irrigation conditions in the experimental field of the Maize Research Institute, Zemun Polje, at Zemun Polje during 2002 and 2003. Yields of the total biomass, dry matter and dry grain per area unit were observed in the following early and medium early maturity hybrids: ZP 105, ZP 196, ZP 243, ZP 256, ZP 307 and ZP 360. Hybrids were sown in the last decade of June and yields were observed over the following sowing densities: 65,000, 75,000 and 85,000 plants ha-1. The highest total biomass yields of 28.08 and 34.11 t ha-1, then the highest DM yields of 12.39 and 13.84 t ha-1 and the highest dry grain yields of 6.66, and 7.41 t ha-1 were registered in hybrids ZP 307 and ZP 360, respectively. The higher sowing density was the higher yields of the total biomass (18.83, 20.82 22.69 t ha-1), DM (10.11, 10.95, 11.85 t ha-1) and dry grain (5.81, 6.21 6.69 t ha-1) were. Ispitivanja su obavljena na oglednom dobru Instituta za kukuruz "Zemun Polje" u Zemun Polju 2002. i 2003. godine u uslovima navodnjavanja. Ispitivan je prinos ukupne biomase, suve materije i prinos zrna po jedinici površine kod ranih i srednje ranih hibrida kukuruza: ZP 105, ZP 196, ZP 243, ZP 256, ZP 307 i ZP 360 sejanih u poslednjoj dekadi juna, u zavisnosti od gustina setve (65.000, 75.000, 85.000 bilj/ha) Hibridi ZP 307 i ZP 360 ostvarili su najveću produkciju ukupne biomase (28,08, 34,11 t/ha), najviši prinos suve materije (12,39, 13,84 t/ha) i najviši prinos suvog zrna (6,66, 7,41 t/ha). Sa povećanjem gustine setve povećan je prinos ukupne biomase (18,83, 20,82 22,69 t/ha), suve materije (10,11, 10,95, 11,85 t/ha) i suvog zrna (5,81 6,21, 6,69 t/ha).

The study presents effects of seven sowing densities (G1 - 40,816, G2 50,125, G3 - 59,523, G4 - 69,686, G5 - 79,365, G6 - 89,286 and G7 - 98,522 plants ha-1) on grain yield of six ZP maize hybrids (ZP 360, ZP 539, ZP 580 ZP 680, ZP 677, ZP 704). The trial was performed on chernozem in experimental fields of the Maize Research Institute, Zemun Polje in the period 1998-2000. A 4-replicate three-year two-factorial trial was set up according to the split-plot method under rainfed conditions. Obtained results indicate to statistically very significant differences in grain yields over investigation years and among maize hybrids. The lowest average yield (6.05 t ha-1), with statistically very significant differences in relation to other two years (1988 - 11.52 t ha-1, 1999 - 11.35 t ha-1) was achieved in the year with the smallest amount of precipitation during the growing season (2000). The highest yields were obtained at different densities in dependence on weather conditions during the growing season and maize hybrids. In relatively favorable years the highest yields of the studied hybrids were obtained in the following densities: ZP 360 - 80-90,000 plants ha-1; ZP 539 -80.000 plants ha-1; ZP 580 - 70-80,000 plants ha-1; ZP 633 - 70,000 plants ha-1; ZP 677 - 60-70,000 plants ha-1; ZP 704 70-80,000 plants ha-1. The following densities were the most favorable under conditions of pronounced water deficit during the growing period: ZP 360 - 70,000 plants ha-1; ZP 539 - 60-70,000 plants ha-1; ZP 580 - 50-60,000 plants ha-1; ZP 633 - 70,000 plants ha-1; ZP 677 - 50-60,000 plants ha-1; ZP 704 - 60-70,000 plants ha-1. U radu su prikazani rezultati proučavanja uticaja sedam gustina setve ( G1 40.816 bilj/ha, G2 -50.125 bilj/ha, G3 - 59.523 bilj/ha, G4 - 69.686 bilj/ha, G5 -79.365 bilj/ha, G6 - 89.286 bilj/ha, G7 - 98.522 bilj/ha) na prinos zrna šest ZP hibrida kukuruza (ZP 360, ZP 539, ZP 580, ZP 680, ZP 677, ZP 704). Trogodišnja ispitivanja (1998-2000) obavljena su u agroekološkim uslovima Zemun Polja u prirodnom vodnom režimu. Dobijeni rezultati pokazuju da su, u godinama proučavanja, između ispitivanih hibrida i gustina ostvarene statistički veoma značajne razlike prinosa zrna kukuruza. U godini sa najmanje padavina tokom vegetacije (2000), ostvareni su najniži prosečni prinosi (6,05 t/ha), sa statistički veoma značajnom razlikom u odnosu na druge dve godine (1988. - 11,52 t/ha, 1999. - 11,35 t/ha). U zavisnosti od meteoroloških uslova tokom vegetacije najviši prinosi ostvareni su različitim gustinama setve. U relativno povoljnijim godinama za gajenje kukuruza ispitivani hibridi ostvarili su najbolje rezultate prinosa u sledećim gustinama: ZP 360 - 80-90.000 bilj/ha, ZP 539 - 80.000 bilj/ha ZP 580 -70-80.000 bilj/ha, ZP 633 -70.000 bilj/ha, ZP 677 - 60-70.000 bilj/ha, ZP 704 - 70-80.000 bilj/ha. U uslovima izrazitog deficita vode tokom vegetacije najpovoljnije gustine su: ZP 360 -70.000 bilj/ha, ZP 539 60-70.000 bilj/ha, ZP 580 - 50-60.000 bilj/ha, ZP 633 - 70.000 bilj/ha, ZP 677 -50-60.000 bilj/ha, ZP 704 - 60-70.000 bilj/ha.