Effect Of Biofertilizers And/Or Urea On Growth, Yield, Essential Oil And ChemicalCompositions Of Cymbopogon Citratus Plants

摘要

This investigation was conducted during two successive seasons (2010 and 2011) in the Experimental Farm Station of the Faculty of Agriculture, Minufiya University, Shebin El-Kom, to optimize the use of Biofertilizers (Nitrobin, Rhizobacteren and Microbein) with or without different doses of Urea in the cultivation of lemongrass (Cymbopogon Citratus). Data clearly showed that, nitrogen as soil application and biofertilizers had a significant effect on vegetative growth characters. On the other hand, the interaction treatments between of N and biofertilizers led to significant increment for yield of essential oil compared to control during both seasons. Using 150 kg N/fed + 1 kg Microbein/fed gave the highest values of essential oil content in both seasons. Citral A (Geranial), was found to be the first major compound in the essential oil of Cymbopogon citratus and ranged from 34.85 to 42.74 %. Its maximum content was observed in the essential oil of the herb that received 75 kg N/fed with 1 kg Rhizobacteren /fed, followed by Citral B (Neral) which ranged from its maximum content (35.62%) with75 kg N/fed without biofertilizer to its minimum relative percent (27.56%) with150 kg N/fed with 1 kg Rhizobacteren /fed and β-Myrcene was identified as the third main constituent (3.42- 10.58%). applications of biofertilizers with nitrogen fertilizers resulted in a significant effect of Polyphenol and flavonoid content in both seasons.