الفهرس 
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Abstract
The present investigation was conducted during two successive seasons of 2000/2001 and 2001/2002 at the Experiment Station of the Faculty of Agriculture at Moshtohor, Zagazig Univ. Banha Branch.
This investigation consists of two experiments: The first experiment:
This experiment was aimed to study the effect of foliar spraying of ascorbic acid at 50 or 75 ppm concentrations and citric acid at 50 or 75 ppm concentrations on vegetative growth, chemical composition and essential oil of Majorana hortensis M. The second experiment:
This experiment was aimed to study the effect of foliar spraying of aloe extract at 25, 50 or 100 % concentrations, garlic extract by ethanol at 25, 50 or 100% and garlic extract by water at 25, 50 or 100 % concentrations on vegetative growth, chemical composition and essential oil of Majorana hortensis M.
The results showed that: The First Experiment
A. Vegetative measurements:
1 All treatments of both citric and ascorbic acids increased the plant height comparing to control, ascorbic acid at 75 ppm increased it in two cuts of two seasons, this increase was non significant in the first cut of the first season.
2- All treatments increased the number of branches per plant comparing to control, ascorbic acid at 75 ppm increased it in two cuts of two seasons. This increase was highly significant.
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3-All treatments increased the fresh weight of herb per plant (g) comparing to control, ascorbic acid at 75 ppm gave the best result in two cuts of two seasons, this increase was highly significant.
4-All ascorbic acid treatments increased the dry weight of herbs/plant (g) comparing to control, ascorbic acid at 75 ppm was more effective at two cuts of two seasons.
5-All treatments increased fresh weight of herbs/fed (ton) comparing to control, while ascorbic acid at 75 ppm was more effective in two cuts of two seasons.
B. Chemical Measurments:
6-All treatments of both citric and ascorbic acids increased chlorophyll -a” content (mg/g fresh weight) comparing to control, ascorbic acid at 50 ppm increased it in the first cut in the first season, while ascorbic acid at 75 ppm increased it in other cuts of this study.
7-All treatments increased chlorophyll ”b” content (mg/2 fresh weight) comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of two seasons, citric acid at 75 ppm recorded the second value in the first cut of the first season.
8-All treatments increased carotenoids content (mg/g) comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of two seasons, while ascorbic acid at 50 ppm recorded the second value.
9-All treatments increased nitrogen percentage comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of two seasons, citric acid at 75 ppm recorded the second value during this study except in the second cut of the second season.
10-All treatments increased phosphorus percentage comparing to control, citric acid at 75 ppm increased it in the first cut of the first Summary
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season, ascorbic acid at 75 ppm increased this parameter in the second cut of the first season and in the first cut of the second season.
11-All treatments increased potassium percentage comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of the first season, citric acid at 75 ppm increased this parameter in both cuts of the second season.
12-All treatments of both citric and ascorbic acids increased carbohydrates content (g/100g) comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of the two seasons
C. Essential oil measurements
13-All treatments increased essential oil percentage comparing to control, ascorbic acid at 50 ppm increased it in the two cuts of the two seasons.
14-All treatments increased essential oil yield/plant (g) comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of the two seasons.
15-All treatments increased essential oil yield/fed (Kg) comparing to control, ascorbic acid at 75 ppm increased it in the two cuts of the two seasons.
16-Ascorbic acid at 75 ppm increased sabinene, limonene and terpinene-4-ol. Citric acid at 75 ppm increased 1,8 cineole, y-terpinene and linalool The second Experiment
A. Vegetative measurements:
1- All treatments increased plant height comparing to control, garlic extract by ethanol at 50% increased it in the first season while garlic.