Document Type : Original Research Article
Authors
1
Dept. of Horticulture, Fac. Agric., Beni-Suef Univ., Egypt
2
Medicinal and Aromatic Plants Research Department, Horticulture Research Institute, ARC, Giza, Egypt.
3
Dept. of Agriculture Microbiology, Faculty of Agriculture, Beni-Suef University, Egypt
4
Dept. of Medicinal and Aromatic plants, Faculty of Agriculture, Beni-Suef University, Egypt
Abstract
This work was carried out during the two successive seasons (2019/2020 and 2020/2021) in the Experimental Farm of Horticulture Research Station at Sids, Beni-Suef Governorate, to investigate the effect of foliar application of gibberellic acid (GA3) at 100, 200 and 300 ppm and spraying of two extractions of liquorice root (aqueous LRE at 5 and 10 g/l and ethanolic LRE at 5 and 10 g/l) and their interaction on the vegetative growth (plant height, number of branches, herb fresh weight per plant and per feddan), volatile oil productivity (oil %, yield per plant and per feddan), total chlorophyll and total carbohydrates,NPK percentages, as well as antimicrobial activity of geranium plants.Obtained results revealed that the best vegetative growth characteristics, volatile oil productivity, total chlorophyll and carbohydrates were obtained due to the use of the high dose (300 ppm) and medium dose (200 ppm) of gibberellic acid with no significant differences between them. Concerning liquorice root extract treatments, all of the prementioned growth parameters, oil yield and chemical traits were considerably augmented due to the high dose of aqueous LRE at 10 g/l treatment followed by ethanolic LRE at 10 g/l, while LRE aqu. at 5 g/l gave the least values. In regard to the interaction between the two studied factors, the highest growth, yield and chemical composition values were given by GA3 at 200 or 300 ppm in combination with LRE aqu. at 10 g/l. Overall, the most powerful antimicrobial activity was recorded of the combination treatment in the two geranium cuts. Therefore, it could be advised from the economical and environmental point of view, to supply geranium plants with GA3 at 200 ppm and LRE aqu. at 10 g/l to improve the volatile oil yield and the antimicrobial activity
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