Response of eggplant (Solanum melongena var. esculenta L) yield to organic and mineral nitrogen fertilization

• Ibrahiem El-Zaael Ibrahiem

  Horticulture Department, Faculty of Agricultural, Omar Al-Mukhtar University

  Author

• Fairoz Ali Bobaker

  Horticulture Department, Faculty of Agricultural, Omar Al-Mukhtar University

  Author

Two field experiments were carried out during the summer seasons of 2006 and 2007, at the Experimental Farm of Horticulture Department , Faculty of Agriculture, Omar Al-Mukhtar University, El-Beida, El-Gabal Al-Akhdar region , to investigate the effects of soil fertilization with varying levels of inogranic nitrogen and organic manure as well as their interactions on yield and its components of eggplant fruites (Solanum melongena L.), cultivar Long Purple.Twenty treatment combinations, representing all possible compinations among five nitrogen levels; 0.0 , 150 , 250, 350 and 450 kg nitrogen/ha, as well as four rates of chicken manure; 0.0 , 10, 15 and 20 ton/ha, were studied in split-plot system in randomized complete blocks design, with four replicates in both growing seasons. The five nitrogen levels represented the main plots, whereas , the four rates of organic manure were randomly distributed in the sub- plots.

The obtained results could be summarized as follow:

1.Gradual increases in the level of applied nitrogen up to 450kg/ha concided with significant increases in total and early fruit yields, number and weight of fresh fruits/ plant, length and diameter as well as fresh and dry weights pf  fruit, and nitrogen use efficiency.

2.Gradual increases in the level of applied chicken manure up to 20 ton/ha, was accompanied with progrissive increases in total and early yields, number and weight of fruits/ plant, length and diameter as well  as fresh and dry weight of fruit, and nitrogen use efficiency. However, the highest two levels, were not significantly differ in their effects on fresh and dry weights of fruit , as well as fruit diameter, in the first season, and early fruit yield as well as length and diameter of fruit in the second one.

3.The obtained results showed positive and significant correlations among the total yields of fresh fruits and their components.

4.Fertilizing eggplant with 450kg N accompanied with 20 ton chicken manure, statistically and significantly increased total and early fruit yields, weight and number of fruit/plant, nitrogen use efficiency, length and diameter , as well as fresh and dry weights of fruit .

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