Effect of some plant growth biostimulants on growth and Volatile oils productivity of Pelargonium graveolens plants

Document Type : Research Articles

Authors

1 Department of Hortic. Minia Univ.

2 Department of Horticultura, Minia Univ.

3 Medicinal and Aromatic Plant Res. Dep., Hort. Res. Inst., Agri. Res. Centre, Cairo, Egypt

4 Department of Horticultura,

Abstract

The improper application of inorganic fertilizers to improve plant growth and productivity is damaging the environment and human health unlike other natural substances with could be efficient and environmentally friendly. Pelargonium graveolens is an aromatic plant that has been used in aromatherapy and traditional medicine. Plants were sprayed with bio-stimulants; brassinosteroids (BRs), seaweed extracts (SW), and chitosan (CH). The BRs were applied at 0, 0.1, 0.2 or 0.3 g/l whereas, SWs or CH at 0, 1 or 2 g/l were treated on the subplot. Plant fresh and dry weights, photosynthetic pigments, and volatile oils (VO) percentages were significantly increased in the three cuts due to the BRs combined application. However, the total yield was significantly increased for all cuts due to both factors. In both seasons the 3rd cut had the highest herbage yield compared with the other ones. In the 1st season the lowest (427.3 g/plant) and highest (1132.0 g/plant) herb fresh weights in the 3rd cut were for untreated plants and (0.3 g/l BRs + 2 g/l CH) respectively. Also, the study demonstrated that the favorable effect of BRs on VO% and yield of rose-scented geranium. The highest VO yields (7.35% being for plants treated with (BRs 0.3 g/l + 1g/l of CH or SW), was 184% higher than the lowest value (2.578 ml/plant) for untreated plants. Therefore, the investigation suggested that treated rose-scented pelargonium with BRs 0.3 g/l + SWs 1 g/l or BRs 0.3 g/l + CH 2 g/l for times could improve the VOs production.

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