PERFORMANCE OF THREE MAIZE HYBRIDS (Zea mays L.) TO PLANT DENSITY AND NITROGEN FERTILIZER.

Abstract

A field experiment was carried out in the autumn season 2013 at ALHawijadistrict 60 km west Kirkuk city to Performance evaluation of threemaize hybrids (DKC 6842, DKC 6610 and Tietar) to two plant densities(66667 and 88889 plant/ha) and three nitrogen fertilizer (300, 350 and 400kg urea/ha) by using RCBD design in split-split plot with threereplications، the main plots represented by the plant density، sub plotsrepresented by nitrogen fertilizer levels and sub-sub plots were representedby the hybrids. The results showed a significant differences between twoplant densities for traits no. of days to 50% tassilling and plant height only،so a significant differences between nitrogen fertilizer levels in traits no. ofdays to 50% tassilling and silking، plant height and ear height. Any traitsof yield and it's components for plant did not affected significantly toplant density and fertilizer levels. The hybrids significantly differ in alltraits were studied except ear height and 500 grain weight. The hybridsresponse for nitrogen fertilizer was more than it's response to plantdensity، the hybrid DKC 6842 were more response than other hybrids tonitrogen fertilizer and plant density.