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
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extract in water at 100% recorded the highest value in the two cuts of the second season.
2-All treatments increased number of branches per plant comparing to control, garlic extract in water at 100% recorded the biggest number of branches during this study period except in the first cut of the first season, garlic extract by ethanol recorded the highest value.
3-All treatments increased fresh weight of herb per plant (g) comparing to control, in the first and second cuts of the first season
and in the second cut of the second season, garlic extract by ethanol at 50% recorded the heaviest weight.
4-Garlic extract by ethanol alcohol at 50% increased dry weight per plant (g) in the first and second cuts of the first and second seasons.
5-All treatments increased fresh weight of herb per fed. comparing to control, in the first and second cuts of the first season and in the
second cut of the second season garlic extract by ethanol at 50% recorded the heaviest weight.
B. Chemical measurements:
6-All treatments increased chlorophyll -a” content (mg/g fresh weight) comparing to control, garlic extract by ethanol at 50% recorded the
highest value in the first season, while in the second season garlic extract by water at 100% recorded the highest value.
7-Garlic extract by water at 100% increased chlorophyll ”b” content (mg/g fresh weight) comparing to control during study period except in the second cut of the first season.
8-Garlic extract by ethanol at 50% and garlic extract by water at 100% presented the highest values of carotenoids content (mg/g).
9-All treatments increased nitrogen percentage comparing to control,
garlic extract by water at 100% increased it in the second cut of the Summary
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second season, while garlic extract in ethanol at 100% increased it in the second cut of the first season and in the first cut of the second
season
10-All treatments increased phosphorus percentage comparing to control, there is no clear trend obtained in this parameter, while aloe extract at 50% presented the highest value in the second cut of the first season, aloe extract at 100% recorded the highest value in the first cut of the second season, while garlic extract by ethanol presented the highest value in the first cut of the first season.
11-All treatments increased potassium percentage comparing to control, aloe extract at 100% increased this parameter in the second cut of the first season and first and second cuts of the second
season.
12-Garlic extract by water at 100% and by ethanol at 50% increased carbohydrates content (g/100g) comparing to control during this
study period.
C. Essential oil measurements:
13-All treatments increased essential oil percentage comparing to control, aloe extract at 100% and garlic extract in water at 100% increased this parameter.
14-All treatments increased essential oil yield/plant (g) comparing to control, garlic extract by water at 100% increased this parameter in the second cut of the first and second seasons.
15-All treatments increased essential oil yield/fed (Kg) comparing to control, garlic extract by water at 100% increased this parameter in the second cut of the first season and in the first and second cuts of the second season.