الفهرس 
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Abstract
Two field experiment were carried out at Tamiya experiment station Agric.Res.center (A.R.C), Fayoum Governorate Egypt, during the two successive season of 2012 and 2013. This investigation aimed to study the competitive ability of some maize hybrids in associated weed. Each experiment included 27 treatments arranged in a split split plot with four replicates.
The treatments were the combinations of three hill spaces i.e. 25,30 and 35 cm occupied main plots ,three weed control treatments i.e. hand hoeing once, hand hoeing twice and unweed (control) (allocated in the sup- plots) and three maize hybrids, i.e. T.W.C 310, T.W.C 1100 and Nefertiti 3, arranged in the sub-sub plots. Narrow plant spacing with any hybrid under this study and using hand-hoeing twice produced the significant reduction in fresh and dry weight in both seasons. Hill space had a significant effect on all studied traits in both seasons except plant height, number of rows per ear and shilling % in 2012 season only. The superiority was for hill space of (35) cm between plants. Significant effect for weed control for all studied traits. Twice hand hoeing (C3) tended to produce the highest values. The differences among three maize hybrids were significant on all characters at two seasons, except shilling % in 2012 only. The superiority was for T.W.C Nefertiti 3 hybrid in most characters followed by T.W.C310. Studied characters at two seasons were significantly or no significant affected by the bilateral and trio-interactions between hill spaces, weed control and maize hybrids.It could be concluded that using hill spaces at 30 cm between maize plants (23333 plants/feddan), controling weeds mechanical by hand hoieng twice and sowing T.W.C Nefertiti 3 produce the greatest yield.
Key words: Hill spaces--- Weed control –– Maize hybrids.