الفهرس 
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Abstract
The present work was carried out during the two successive seasons of 2010/2011 and 2011/2012 at the experimental Baramoon Research Farm, Dakahlya Governorate, Egypt to study the effect of application of chemical, organic and biofertilizers on the vegetative growth, essential oil productivity and chemical composition of Mentha piperita, L. plants. Uniform cuttings of peppermint planted in the nursery on Oct. 15th in both seasons. Seedlings were transplanted at April 15th in both seasons. Uniform cuttings of Mentha piperita, L [peppermint] (15-20 cm length) were taken from summitry mother plants and planted in the nursery under shaded conditions for rooting on Oct. 15th 2010 and 2011 seasons. Experimental area was divided into plots in 3 replicates, the plot area was (4 m × 5 m), containing 5 ridges with 60 cm apart, ridge was 5 meters long. Rooted cuttings (seedlings) were transplanted at April 15th and planted 30 cm apart on the eastern side of each row which contained (16) plants in an irrigated soil. The experimental design was split-plot design factorial experiment complete randomized block design. The plants of Peppermint were harvested twice every season by cutting the vegetative aerial parts of plants at 10cm above the soil surface. The first cut was carried out in the second week of June and the second cut was in the second week of September. This study revealed the following results :- 1.Fertilize Mentha piperita L. plants with half dose of NPK combined with 30 m3 FYM/feddan, phosphorein and microbein added as 2kg /fed., from both of them, one month after transplanting and repeated after each cut as soil drench to obtain the best essential oil yield . 2.Fertilize Mentha piperita L. plants with half dose of NPK combined with 30 m3 FYM/feddan, phosphorein (2kg/feddan) and humic acid (6L/feddan) to obtain the best vegetative growth. 3.All the previous recommendations led to reduce the pollution of environment resulting from the expensive use of chemical fertilizers by saving have quantity of NPK.