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Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Medicinal and aromatic plants production under salt stress. A review

100%
Said-Al Ahl H. A. H., Omer E. A.
Herba Polonica
|
2011
|
tom 57
|
nr 2
Salinization of soils or waters is one of the world’s most serious environmental problems in agriculture. It is necessary to determine the environmental factors under which medicinal and aromatic plants give higher yields and better quality. The problem of salinity is characterized by an excess of inorganic salts and is common in the arid and semi-arid lands, where it has been naturally formed under the prevailing climatic conditions and due to higher rates of evapotranspiration and lack of leaching water. Although more frequent in arid lands, salt-affected soils are also present in areas where salinity is caused by poor quality of irrigation water. Saline soil induces physiological and metabolic disturbances in plants, affecting development, growth, yield, and quality of plants. Plants affects adversely as a result of salinity, seed germination, survival percentage, morphological characteristics, development and yield and its components. In general, salt stress decreases the photosynthesis and respiration rate of plants. Total carbohydrate, fatty acid and protein content were adversely affected due to salinity effect, but increased the level of amino acids, particularly proline. The content of some secondary plant products is significantly higher in plants grown under salt stress than in those cultivated in normal conditions. The salinity tolerance depends on the interaction between salinity and other environmental factors.
2
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Effect of water stress and nitrogen fertilizer on herb and essential oil of oregano

80%
Said-Al A. H. A. H., Omer E. A., Naguib N. Y.
International Agrophysics
|
2009
|
tom 23
|
nr 3
269-275
3

Effect of the nitrogen fertilizer forms and time of their application on the yield of herb and essential oil of Ocimum americanum L.

71%
Omer E. A., Elsayed A.-G. A., El-Lathy A., Khattab M. E., Sabra A. S.
Herba Polonica
|
2008
|
tom 54
|
nr 1
The effect of various forms of nitrogen fertilizer and dates of application on Ocimum amercianum yield and essential oil (ton/feddan, 1 feddan = 4200 m2) was studied in two successive seasons. In both seasons the total yields of fresh and dry herb after the application of ammonium sulfate surpassed that of ammonium nitrate and urea. Dividing the full amount of fertilizer into two equal portions gave the highest yields in most cuts. Nitrogen fertilizers affected the percentage of essential oil in most cuts. The highest oil percentage was obtained after the application of ammonium nitrate and ammonium sulfate in both cuts in the first season, respectively, and urea in the second season. Early addition of the full amount of fertilizer was more effective in increasing oil percentage as compared to other two dates of application. Ammonium sulfate in the first season and urea in the second one produced the highest total oil yields either per plant or per feddan. One application of the full amount of ammonium nitrate at the early date produced the highest total percentage of monoterpenic compounds as compared to ammonium sulfate and urea. One application the full amount of nitrogen fertilizer at the early date was superior to other treatments. The opposite was true for sesquiterpenes. Oxygenated compounds showed the same trend of monoterpenic compounds. Thus, the application of ammonium sulfate at the rate of 60 kg N/fed/season at two equal portions in each cut could be recommended for maximizing herb, leaves and oil yields of Ocimum amercianum, L. var. pilosum plants.
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