Effect of irrigation and antitranspirant treatments on growth, yield and chemical constituents of marjoram plants, Majorana hortensis moench
2010
Abou Dahab, T.A.M. | Harridy, I.M.A. | Mansour, B.A.B.
. The investigation aimed to study the effects of irrigation at 25, 50 and 75% of available soil moisture depletion (ASMD) combined with antitranspirant agents: active dry yeast (ADY) at 6 or 8 g/1 as bio-antitranspirant, sodium salicylate (S.S.) at 10 or 20 ppm and magnesium carbonate (MgCO3) at 15 or 30 ppm as chemical antitranspirants beside the control (0.0) in order to regulate water irrigation and study their effect on vegetative growth and volatile oil characteristics of marjoram plants (Majorana hortensis, Moench). The obtained results are summarized as follows: in all cuts in the two seasons, the plants received ADY at 6 or 8 g/1 were significantly taller than the plants treated with (S.S. and MgCO3) or the control. The same trend was observed on the branching of marjoram plants. The lowest value was when the plants were treated with MgCO3 at 30 ppm in most cases. The percentage of volatile oil in all treatments decreased except the treatment of MgCO3 at the rate of 30 ppm in the first season, and the treatment of S.S. at the rate of 10 ppm in the second cut of the second season. The highest volatile oil per plant and per feddan through the two seasons was achieved when the plants were sprayed with ADY at 6 or 8g/l combined with irrigation at 25% ASMD. On the other hand, GLC analysis of the oil in the second cut of the first season showed that Terpinene-4-ol, Linalyl acetate and a-Terpineol were the main components in the volatile oil using the irrigation treatment at the rate of 25 or 75% ASMD.
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