SUMMARYThe present investigation was carried out to study the effect of irrigation regimes (irrigation levels and irrigation intervals) upon the chemical constituents of Hibiscus sabdariffa. The results can be summarised as follows:1. The treatment of 100m3/irrigation water/irrigation/feddan* as well as 35 and 45 days intervally irrigated treatments resulted in a highly significant increase in the total soluble solids percentage of fruit calyx beverage.2. The acidity of the fruit calyx beverage had the same value under the various treatments in both the two experiments of irrigation treatments.3. The synthesis of anthocyanins and flavones which are responsible for the red color in the fruit calyx of Hibiscus sabdariffa was significantly stimulated by the treatment of 150m 3 irrigation water/irrigation/feddan as well as the 15 days intervally irrigated treatment.Therefore an increase in the reddish color of Hibiscus sabdariffa fruit calyx could be attained by irrigating the plant with 150 m 3 water at 15 days intervals during the plant life cycle.
Plant species under obligate vegetative propagation such as Cymbopogon citratus, L. in Egypt are capable of expressing physiological homeostasis, particularly, when the genetic load is minimized. The illucidation of homeostatis contributions could, therefore, be manipulated under effect of stage wise differential biotic conditions to space the deduced polymorphic expressions that were cryptic before exogenous treatments. In a pot experiment, lemon grass received, therefore, integrated combinations of N and P made of equal portions of 2.4, 4.8 and 7.2 g/pot as well as doses of gibberellic acid treatments of 75 and 150 ppm in the first season or 75, 100 and 125 in the second season. Two cuts representing summer and Winter season were obtained. In conclusion marked variability was noticed in contents of photosynthetic pigments, total carbohydrates, protein, C/N ratio, essential
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