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Elham M. Attia and Rania M. Khater* Department of Medicinal and Aromatic Plants, Desert Research Center, Matareya Cairo, Egypt * E-mail: dr.raniakhater@yahoo.com * his research was conducted at the El-Qantara Sharq Research Station, Desert Research Center, during two successive summer seasons of 2013 and 2014 to study the effect of planting dates (15 th April, 1 st May and 15 th May) and organic fertilization treatments (control, 15 m 3 / feddan cattle manure, 15 m 3 / feddan compost and a mixture of organic fertilizers [15 m 3 / feddan compost + 15 m 3 / feddan cattle manure]) on growth, yield and active ingredients of Hibiscus sabdariffa L. plants. Early planting date (15 th April) resulted in significant increase in all growth characters, while delaying the planting dates decreased it in both seasons. The application of organic fertilizers produced the highest value in all growth characters during the two experimental seasons, while the treatment of mixed organic fertilizer significantly increased vegetative growth parameters, chemical ingredients and the chemical constituents. The interaction between planting dates and organic fertilization show that, the treatment of cultivation date on 15 th April and fertilization with mixed organic fertilizer significantly increased most of the studied characters, however this treatment gave the maximum sepals per plant and per feddan, yield of seeds per plant and per feddan, the anthocyanins content and fixed oil content in seeds compared with the other treatments.

EFFECT OF DIFFERENT PLANTING DATES AND ORGANIC FERTILIZERS TREATMENTS ON GROWTH AND YIELD OF HIBISCUS SABDARIFFA L. PLANTS