Effect of organic and inorganic nitrogin on plant growth of eggplant (Solanum melongena var. esculenta L) and its chemical composition
DOI:
https://doi.org/10.54172/mjsc.v22i1.1051Keywords:
nitrogin, organic, inorganic, eggplantAbstract
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 interaction on some vegetative growth characters, as well as on some chemical contents of leaves of eggplant (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.Increasing the level of applied nitrogen up 450kg /ha significantly increased fresh and dry weights of vegetative growth , leaves and branches/palnt, plant height as well as number and area of leaves/plant.
2.Fertilizing eggplant with gradual increaments of N up to 450 kg/ha, resulted in progressive and significant increases on leaves nitrogen, phosphorus and chlorophyll contents , whereas, application of N at rates above 250 kg/ha significantly decreased leaves K content.
3.Constant increases in the level of applied chicken manure up to 20 ton/ha, resulted in consistent and significant increaments on the studied growth parameters in the two growing seasons.
4.Application of progrissive levels of organic manure up to 15 ton/ha, constantly and significantly increased leaves N, P, K and chlorophyll contents. Meanwhile , increasing the level up to 20 ton/ha, did not significantly affect the above mentioned components.
5.The obtained results showed positive and significant correlations among the stuied traits ; vegetative growth characters and chemical contents
6.The combination treatment of 20 ton chicken manure together with 450 kg N/ha, gave the highest values of fresh and dry weight of vegetative growth , leaves and branches/ plant, number and area of leaves/plant, as well as plant height.
- Combination of N at rate of 450 kg with 15 or 20 ton chicken manure, significantly produced the highest leaves N, P and chlorophyll contents, meanwhile , the combination treatment of 250 kg N+20.
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