الفهرس 
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Abstract
The present study was conducted on Majorana hortensis L. plants during the two successive seasons 2009 and 2010 at the nursery of Medicinal and Aromatic plants Research Department, Horticulture Research Institute, Agriculture Research Center, Ministry of Agriculture, Dokki, Giza, Egypt. This work was designed in order to investigate the possibility of reducing the need for NPK chemical fertilization as well as improving plant productivity by using bacterial biofertilization as an alternative. The plants of control treatment received only the full recommended rate of NPK chemical fertilization as ammonium sulphate, calcium superphosphate and potassium sulphate. For the other treatments, a single inoculum or mixture of different inoculum combinations of Azospirillum brasilense, Bacillus megatherium var. phosphaticum and Frateuria aurantia were used in combination with NPK chemical fertilizer as quarter or half dose of the full recommended rate. Results obtained showed that plants received 1/4NPK dose with the biofertilizer gave higher values of vegetative characteristics and chemical composition than those received 1/2NPK with the same biofertilizer during the three cuts of both seasons. Gas chromatography analysis of volatile oil indicated that the main components were linalool, terpinen-4-ol and limonene
Keywords: Chemical fertilization, Bio-fertilization, Marjoram, Majorana hortensis