IMPACT OF POTASSIUM SILICATE AND SALICYLIC ACID ON GROWTH, FLOWERING AND QUALITY CHARACTERS OF DENDRANTHEMA GRANDIFLORUM PLANTS UNDER GREENHOUSE CONDITIONS

Document Type : Original Research Article

Authors

1 Ornamental Plants and Landscape Gardening Research Department, Horticulture Research Institute, Agricultural Research Center, Egypt

2 Ornamental Plants and Landscape Gardening Research Dept., Hort. Res. Inst., Agricultural Research Center, Giza, Egypt

Abstract

The impacts of foliar spraying with different potassium silicate concentrations (0.0, 300, 600 and 900 ppm) and salicylic acid (0.0, 100, 200 and 300 ppm) on growth, flowering aspects and some chemical constituents of Dendranthema grandiflorum (Ramat.) Kitamura plant cv. White Rivor were evaluated. Under plastic house conditions, this experiment was carried out at Ornamental Nursery of Faculty of Agriculture, Zagazig University, Egypt, during the consecutive summer seasons of 2019 and 2020. The treatments were laid out in a factorial randomized block design (4 × 4) with three replicates per treatment. The plant height, number of branches and leaves, root length and total fresh and dry weights per plant were significantly greater with 900 ppm potassium silicate treatment compared to the other ones; likewise, the number of inflorescences and flower heads per plant, as well as flower stalk length, were significantly higher. Early flowering and the largest flower heads were achieved in the foliar spray plot with 600 ppm potassium silicate. Using 900 ppm potassium silicate concentration significantly increased total carbohydrates percentage and total chlorophyll content compared to control. In the same trend, using 300 ppm of salicylic acid as foliar spray significantly increased all growth parameters, flowering traits and chemical constituents compared to the other ones under study.  From these results, it can be concluded that the interaction treatment application of potassium silicate at 900 ppm plus salicylic acid at 300 ppm proved to have beneficial effects on the growth, flowering and quality of Dendranthema grandiflorum cv. White Rivor plant

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