الفهرس 
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Abstract
This investigation was carried out during the growing season of 2010 at the experimental Farm of El- Baramon, Horticulture Research Station; Institute of Agriculture Research Center; Dakahliagovernate; Egypt, to study the effect of organic and biofertilizers on the production of peppermint plants (MenthaPipperitaL.), and their interactions on the vegetative growth vigor, essential oils content, chemical composition of fresh leaves and dry herb, endogenous phytohormones content and antibacterial activity of peppermint plants. Fourteen treatments were arranged in complete randomize block design with three replicates. Thus, the total number of the experimental plots was 42 plots. The full dose of NPK (300 N, 150 P2O5 and 75 K2O kg/fed) [ammonium sulphate 20.5% N, calcium supper phosphate 15.5% P2O5 and potassium sulphate 48% K2O] as recommended of Agricultural Ministry in Egypt. Calcium super phosphate was applied during the preparation of soil, ammonium sulphate and potassium sulphate were added at three equal doses ; the second dose was added after the first addition with 21 days and the third one after the first cut. Organic manures of both poultry and cattle were added with calcium super phosphate during the prepration of soil. then the field was irrigated while biofertilzer which was a mixture of effective microorganisms and termed with (E.M), was obtained from Agricultural Ministry in Cairo and was sprayed at three rate 1L., 2L and 3L/fed., when the seedlings became full mature after 21 days of cultivation and the manure of addition was foliar spraying at early morning before sunrise. It can be concluded that; a stimulations effects were happened due to the soil application of the studied organic manure rates in single form with superiority effect for poultry manure more than of cattle manure. Foliar application of EM at the three levels under investigation in soil addition had a primitive effect in all parameters investigated and these effects were more than those obtained from the single addition of organic manure, but less than that obtained from the control treatment.
Treating peppermint plants with EM at any level in foliar way in combination with organic manures; 18 m3/fed has been recorded the highest mean values of all parameter under study. These values achieved to be more than that obtained from the solely addition of the investigated factor and, also more than those realized for the control treatment.
• Foliar application of EM at the three levels under investigation in soil addition had a primitive effect in all parameters investigated and these effects were more than those obtained from the single addition of organic manure, but less than that obtained from the control treatment.
• Treating peppermint plants with EM at any level in foliar way in combination with organic manures; 18 m3/fed has been recorded the highest mean values of all parameter under study such as Vegetative growth characteristics, Essential oil productivity and its components, Chemical analysis, Estimation of endogenous phytohormonescontent and Antibacterial activity essential. These values achieved to be more than that obtained from the solely addition of the investigated factor and, also more than those realized for the control treatment.
• Studying the antimicrobial activity of extracted oil after first and second cuts using disc diffusion method revealed significant activity against all tested bacteria strains (S. aureus, B. subtilis, Pseudomonas aeruginosa and Klebsiella pneumonia) which increased proportionally with increase in oil concentration. Obviously, there was no significant difference in the activity of oil extracted after first and second cuts.