الفهرس 
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Abstract
Coriandrum sativum, L. is one of the most economical and promising medicinal and aromatic plants grown in Egypt, It belongs to Family Apiaceae (Umbllifera) and it is considered as one of the most important and widely cultivated medicinal and aromatic plants grown in middle Egypt Governorates, especially Minia Governorate as an annual herb. The fruits contain 0.2- 1.0 % essential which contain 65- 70 % of linalool (coriadrol) and pinene. Coriander fruits are used for flavoring food products, pharmaceutics and perfumes. The volatile oil is involved in different pharmaceutical purposes and food industry.
The present study was carried out during tow successive seasons, 2004/2005 and 2005/2006 at the Experimental farm, Research Center, at Shosha, West Samalout, Minia Univ. The influence of five NPK and micronutrients fertilization treatments as the main factor , and tow antioxidants namely , salicylic and ascorbic acids as the secondary factor and their interaction on the vegetative growth , yield components , essential oil determinations and chemical composition of coriander plants under dripp irrigation system .
The most important results could be summarized in the following paragraphs:
I-Effect of NPK and micronutrients fertilization treatments:
The three NPK minerals and tow micronutrients (Zn and Mn) fertilization treatments increased considerably different vegetative growth characters of coriander plants such as plant height, stem diameter, main branch number and herb dry weights.
The highest number of umbels / plant , number of fruits / umbellule , weight of fruits / plant , plot and feddan , were obtained when coriander plants were supplied with either low NPK + micronutrients and high of NPK with or without micronutrients fertilization .
Similar promoting treand due to the use of all fertilization treatments, was observed for essential oil percent and yield per plant and per feddan, with the high rate, followed by the low rate of NPK with or without micronutrients, fertilization treatments producing the highest values of essential oil yield.
Concerning photosynthetic pigments and nitrogen, phosphorus and potassium % and content they were greatly stimulated due to the use of all mineral NPK + micronutrients fertilization rates, especially the high one.
Effect of antioxidants:
Spraying coriander plants with salicylic and ascorbic acids each applied at two concentrations i.e. 200 ppm and 300 ppm ,resulted in taller plants , thicker stems, more branches number/ plant, as well as, heavier dry weight of herb / plant , than those of untreated control plants. The most effective treatments which gave the highest values regarding the vegetative growth traits were, in most cases, ascorbic acid at 300 ppm and salicylic acid at 300 ppm.
Using of salicylic and ascorbic acids at 200 or 300 ppm and ( SA. at 300 ppm +AS. at 300 ppm ) as foliar spray on coriander plants significantly improved total number of umbels /plant , number of fruits / umbellule , weight of fruits per plant , per plot and per feddan in comparison with untreated plants . In most cases, the highest concentrations (300 ppm) of each antioxidant was the most beneficial treatment which resulted in the maximum values.
Essential oil % and yield per plant and per feddan were considerably increased due to high levels of antioxidant concentrations, the highest oil yield being obtained due to the use of (Salicylic acid at 300 ppm + Ascorbic acid at 300 ppm).
All chemical constituents, including photosynthetic pigments and nitrogen, phosphorus and potassium % and content were stimulated by both of the high levels of salicylic and ascorbic acids treatments. Moreover, the influence of salicylic acid at 300 ppm and ascorbic acid at 300 ppm were greatly efficient in increasing the percentage and content of N,P and K and photosynthetic pigments.
Effect of the interaction:
Obtained results in this experiment indicated that the interaction between NPK and micronutrients fertilization and antioxidants concentrations was mostly effective in increasing vegetative growth characters. Moreover, the use of high rote of NPK + micronutrients fertilization (N2P2K2 + micro.) in combination with the high concentrations of antioxidant (salicylic acid at 300 ppm + ascorbic acid at 300 ppm), resulted in the best vegetative growth characters.
Yield component parameters, namely number of umbels / plant, number of fruits / umbellule, weight of fruits / plant, per plot and per feddan, were augmented by the application of the high rate of NPK fertilization in combination with high antioxidants levels. However, the high NPK rate and micronutrients plus (SA. at 300 ppm + AS. at 300 ppm) gave the best overall values of fruits yield per plant, per plot and per feddan.
The highest oil percentage and yield of essential oil per plant and per feddan were obtained from the combined N2P2K2 + micronutrients (Zn + Mn) plus (salicylic acid at 300 ppm + ascorbic acid at 300 ppm).
Concerning photosynthetic pigments and N, P and K % and content were greatly increased due to the use of N2P2K2 + micronutrients (Zn + Mn) plus (salicylic acid at 300 ppm + ascorbic acid at 300 ppm).
Recommendation:-
It is recommended to supply coriander plants with NPK + micronutrients (Zn + Mn) fertilization at the high rate (N2P2K2 + micronutrients) {325 kg/ fed. ammonium sulphate 20.6 % N + 300 kg/ fed. superphosphate 15.5 % P2O5 + 100 kg/ fed. potassium sulphate 48.5 % K2O} and (Zn at 100 ppm + Mn at 50 ppm, as foliar spry) plus the high antioxidants concentration (salicylic acid at 300 ppm + ascorbic acid at 300 ppm).