الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 116 |  |  |
| | | from | 116 | | |
Abstract
Coriander,Coriandenm1 Sativum L., plant is considered as one of the most important medicinal and aromatic plants. It belongs to Family Umbelliferae (Apiaceae) widely grown in middle Egypt region specially in Minia Governorate. The seeds contain 0.2-1 % volatile oil (oleum coriander). This contains 65-700/0 oflinalol (coraindrol) and pinene. The seeds are used for flavouring food production, pharmaceutices and Perfums.
The present investigation was carried out during two successive seasons: 1998 / 1999 and 1999 / 2000 in the experimental Farm and Laboratory of ornamental plants division, Horticulture department, Faculty of Agriculture. Minia University. This study was planned to study the response of coriander plants 4 to phosphorus fertilization in sort of single calcium superphosphate at three levels, 100,200 and 300 kg per feddan, and application of zinc at 50 and 100 ppm and active dry yeast at 2.5 and 5.0 g/l separately or in combinations as foliar spray as well as the interaction between phosphonls fertilization and both zinc and yeast. The experiment was arranged in a split plot design.
The most important results could be summarized in the following paragraphs :
1- The effect of phosphorus fertilization:
- Different vegetative growth parameters, namely, plant height, stem diameter, branch number per plant and fresh weight of the herb/plant were incresed due to the use of phosphorus at the medium and high levels in comparison to the low level, while herb dry weight/plant was not affected due to phosphorus fertilization treatments.
-Yield of dry seeds per plant and per feddon were augmented due to phosphorus fertilization at the high level (300 kg/fed) compared to the low and medium ones.
- Photosynthetic pigments namely, chlorophyll a, chlorophyll band carotenoids in the fresh leaves were stimulated as a result of supplying coriander plants with the medium and high levels of calcim superphosphate compared to the low one. The most effective level was the high one
- Regarding the volatile oil parameters, it is clear from the obtained date that oil percentage and oil yield per plant and per feddan were increased due to phosphorus fertilization. The best results were obtained by the use of single calcium superphosphate at 300 kg/fed.
A
- Reducing and total soluble sugars they were promoted as a result
of fertilizing coriander plants with single calcium superphosphate at 200 and 300 kg/fed in comparison with 100 kg/fed.
- Phosphonls fertilizer at 200 or 300 kg/fed increased both phosphorus percentage and phosphorus content in the herb compored to 100 kg/fed . The highest values were obtained by application of phosphorus fertilizer at 300 kg/fed.
II The effect of Zinc and active dry yeast: -
Application of zinc at 50 or 100 ppm and active dry yeast at 2.5 or 5.0 g/l separately or in combinations (Zn at 50 ppm + yeast at 2.5 g/l ., Zn at 50 ppm + yeast at 5.0 g/l, Zn at 100 ppm + yeast at 2.5 g/l and 100 ppm + yeast at 5.0 g/l) significantly increased vegetative growth parameters: plant height, stem diameter, branch number per plant and herb fresh and dry weights compared to control. In most cases the high concentration of
both Zn or active dry yeast applied separately was more effective than the low one, and the combinations of both substances, Zn and yeast were the most effective treatments, wheras Zn at 100 ppm combained with active dry yeast at 5.0 g/I produced the highest values in comparison with other treatments including the control.
II Effect of the interaction between phosphorus fertilization and sprayioe with Zn or active dry yeast:
Generally, the inte~action treatments were effective on the vegetative growth, seed yield, volatile oil and chemical composition of coriander plants. The most effective interaction treatments were : fertilizing coriander plants with the high level of single calcium superphesphate (300 kg/fed) and sprayed the plants with Zn at 100 ppm combained with active dry yeast 2.5 or 5.0 g/I. followed by application of the medium level of the P fertilizer (200 kg/fed) and spraying with Zn at 100 ppm + yeast at 2.5 or 5.0 g/I. These interaction treatments increasesd the most of parameters concerning vegetative growth (plant heigh, stem diameter, branch number / plant and herb fresh and dry weights) Also, these interaction treatments enhanced the yield of dry seeds per plant and per feddan and volatile oil aspects (oil% and oil yield per plant and per feddan ). Moreover, chemical constituents (photosynthetic pigments, reducing and total soluble sugars as well as phosphorus percentage and P content were augmented due to the interaction treatments.