الفهرس 
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Abstract
The current investigation was carried out at the extension field at Mahelt Engaq Village, Sherbin Center, Dakahlia District during summer growing seasons of 2014 and 2015. The objectives of this investigation was aimed to study the effect of inter- intra row spacing on plant growth, yield, and yield components of some maize hybrids.Two field trials were conducted during 2014 and 2015 summer growing seasons. Two separate experiments were conducted for each ridge spacing (RS), i.e. 60 and 70 cm between ridges. The experimental design used in each trial was split - plot design in four replications. The main plots were assigned for maize hybrids i.e. S.C. 3084, S.C. 3062, S.C. 2055 and S.C. 2066 and hill spacing at 15, 20, 25 and 30cm hill spacing apart were randomly distributed in the sub - plots. Combined analysis was done over the two ridge pacing. Regarding the effect of ridge width (60 and 70 cm between ridges) on maize flowering and growth characters i.e. number of days to 50% tasseling, number of days to 50% silking, number of leaves/plant, chlorophyll content, ear leaf area, stem diameter, plant height and ear height and yield and yield components i.e. number of ears/plant, ear length, ear diameter, number of rows/ear, number of grains/row, ear grains weight, shelling percentage, 100-grain weight and grain yield/fed. The obtained results of this study apparently cleared that there was a significant effect in both seasons, with exception number of green leaves/plant, total chlorophyll content in leaves, plant height, number of ears/plant and ear diameter in the first season, ear height, ear length and number of rows/ear in the second season and number of grains/row and grains weight/ear in both seasons.The results indicated that a significant differences among four yellow maize hybrids of S.C. 3084, S.C. 3062, S.C. 2055 and S.C. 2066 were detected at flowering and growth characters i.e. number of days to 50% tasseling, number of green leaves/plant, chlorophyll content, ear leaf area stem diameter, plant height and ear height and yield and yield components i.e. number of ears/plant, ear length, ear diameter, number of rows/ear, number of grains/row, ear grains weight, shelling percentage, 100-grain weight and grain yield/fed in both seasons. On the other hand, number of days to 50% silking in both seasons, number of green leaves/plant in the first season and stem diameter in the second season did not reach to significant differed due to studied maize hybrids. Concerning to the effect of hill spacing i.e. 15, 20, 25 and 30 cm hill spacing apart on maize flowering and growth characters i.e. number of days to 50% tasseling, number of days to 50% silking, number of green leaves/plant, chlorophyll content, ear leaf area stem diameter plant height and ear height and yield and yield components i.e. number of ears/plant, ear length, ear diameter, number of rows/ear, number of grains/row, ear grains weight, shelling percentage, 100-grain weight and grain yield/fed. The obtained results of this study clearly indicated that hill spacing significantly affected these traits in both seasons excluding number of green leaves/plant, number of rows/ear and number of grains/row in the first season only. Our results indicated that there was a significant effect due to the interaction between maize hybrids and ridge width on number of days to 50 % tasseling and ear diameter (in the first season), number of days to 50 % silking, number of green leaves/plant and shelling percentage (in the second season) and plant and ear height, ear length, grains weight/ear, 100-grain weight and grain yield/fed (in both seasons).It could be concluded that sown S.C. 3084 hybrid at ridge width of 60 cm at hill spacing of 20 cm apart maxmized maize productivity under the environmental conditions of Dakahlia Governorate, Egypt.