Effect of splitting different nitrogen fertilizer levels on productivity of maize [electronic resource].

Includes references.

The present investigation was conducted for two seasons (2002 and 2003) at the Experimental Farm ,Faculty of Agric., Zagazig Univ.,to study the effect of four nitrogen levels ( 0 ,40 ,80 and 120 kg Ifad) and three times of application (T1: 112 at 20 day after sowing + Y, at 35 day after sowing, T2 : 113 at 20 day after sowing +113 at 35 day after sowing +1/3 at 50 day after sowing and T3: 114 at 20 day after sowing +114 at 35 day after sowing +114 at 50 day after sowing +114 at 65 day after sowing) on yield and its components ofthe maize hybird S.C .10. The obtained results indicated that the increase of N level up to 120 kg N/fad significantly increased plant height, ear height, stalk diameter, ear diameter, ear length rowslear, grainslrow, grains lear, grain ear weight, shelling % and grain yield Ifad . Regarding the time of application, addition of nitrogen in two equal doses significantly increased yield and all of its attributes under study. The results clearly reveal that the ear grain weight, number of grainslear and the interaction between number of grains lear and ear grain weight are considered the main sources of grain yield variation, having the relative contribution of 65.05 ,3.79 and 17.26%, consecutively. However, the contribution of 100-grain weight and number of grains lear with 100 -grain weight had low contribution to final grain yield Ifad, viz: 0.28 and 1.36 consecutively.

Summary in Arabic.

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