الفهرس 
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Abstract
This field study was intended at Gemmeiza Agric. Res. St., Gharbia Governorate, Egypt during 2013 and 2014 seasons to evaluate the response of two maize cultivars (SC 128 as a white cultivar and SC 168 a yellow one) to three nitrogen fertilizer levels, being: 90, 120 and 150 kg N/fad and four weed control regimes(1-un-weeded check as W1, 2- hand hoeing twice at 18 and 30 days old as W2, 3- Harness herbicide 84 % Ec sprayed pre-emergence at the rate of one litre/fad as W3 and at last 4- using Harness herbicide 84 % Ec plus hand hoeing oncely at 30 days from planting as W4 as well as their interactions on maize growth, associated weeds, yield and quality. The split-split plot system of four replications was used in this study. Each experimental area size was 19.2 m2 (3.2 m width and 6 m length, having four ridges). The obtained results indicated that: the four weed control methods, the three nitrogen fertilizer levels and their interactions reflected significant effects on all maize characters of the two cultivars and associated weeds (either broad or narrow-leaved, in both seasons and over them as well).
The findings clearly showed that the best treatment effects on the studied characters were in favour of using W4 treatment that involved both Harness herbicide in condition with hand hoeing oncely as well as utilizing the highest N level of 150 kg N/fad, and such favourable effects of these treatments that used either individually or in combination were fairly obvious for both SC 128 and SC 168 maize cultivars, being more noticeable for the former one. Also, the simple correlation results indicated strong relations between maize grain yield/fad and its attributes clearing the efficacy of the studied treatments in favouring the final maize yield/fad. Beside, the path analysis findings revealed that maize ear length, number of grains/row and grain index proved to be more contributors for grain yield changes.
Shortly, the top yielding maize cultivar SC 128 can successfully be grown in Gemmeiza Location, Gharbia Governorate, Egypt by utilizing 150 kg N level/fad under the more acceptable weed control method (integrated method conducted by using Harness herbicide 84 % Ec at one litre/fad as a pre-emergence herbicide of effective mode of action for both broad and narrow-leaved weeds along with hand hoeing oncely at 30 days old) that could be adopted efficiently to suppress weed growth to the lowest extent with enhancing the final maize grain yield per unit land area.