الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The obtained results could be summarized as follows: 1- Effect of compost:1-A- Vegetative growth traits: All plant growth traits of lavender plants, namely, plant height / cut, stem diameter / plant / cut, number of branches / plant / cut, leaf area / plant / cut, herb fresh and dry weights / plant / cut and yield of herb fresh and dry weights / plant / season were significantly promoted by fertilizing lavender plants with compost at 10, 20 and 30 % compared with unfertilized control plants. The increment in vegetative growth aspects was parallel with the gradual increase in compost level, therefore, high level of compost (30 %) was the most effective treatment. 1-B- Essential oil productivity: Essential oil determinations namely, oil percentage in the fresh herb / plant / cut, oil yield / plant / cut and / plant / season of lavender plants were significantly increased by the three used levels of compost compared with control. The most effective treatment, which gave the highest essential oil (oil % and yield / plant / cut and / plant / season) was the high level of compost (30 %). 2- Effect of bio. and/ or mineral NPK fertilization treatments: 2-A- Vegetative growth traits: All plant growth traits (plant height, stem diameter / plant / cut, number of branches / plant / cut, leaf area per plant / cut, herb fresh and dry weights / plant / cut and yield of herb fresh and dry weights / plant / year were significantly increased due to the use of all treatments over the control treatment in both seasons. However, E.M. + 75 % N (N2PK) followed by mineral N3PK (full dose) treatments gave the highest values without significant differences between them selves in all cases. 2-B- Essential oil productivity: A significant increase in the essential oil % and essential oil yield / plant in the two cuts, as well as, essential oil yield / plant / season in comparison with control treatment in both seasons as a result of the used fertilization treatments. The highest values were obtained due to the treatments of E.M. + 75 % N (N2PK) followed by mineral N3PK (full dose) than M.A. + 75 % N (N2PK) without significant differences between the first and second treatments in all cases. 3- Effect of the interaction treatments: 3-A- Vegetative growth traits: • The interaction between compost and bio. and / or mineral NPK fertilization treatments was significant for all vegetative growth traits of lavender plants in comparison with control treatment in most cases during both seasons. • The highest values for all vegetative growth traits were due to adding compost (30 %) in combination with E.M. + 75 % N (N2PK) or with mineral N3PK (100 % N). 3-B- Essential oil productivity: • The interaction treatments was significant for essential oil % and essential oil yield / plant in all cuts, except for the first cut during the first season. But it was significant for essential oil yield / plant / season. The highest values were obtained due to compost at 30 % in combination with E.M. + 75 % N (N2PK) or with mineral N3PK (full dose).