EFFECT OF PLANTING DATES, ALGAE EXTRACT AND NITROGEN FERTILIZER RATES ON THE GROWTH AND PRODUCTIVITY OF CALENDULA OFFICINALIS L. UNDER SANDY SOIL CONDITIONS | ||
| Scientific Journal of Flowers and Ornamental Plants | ||
| Volume 11, Issue 3, September 2024, Pages 209-224 PDF (780.57 K) | ||
| Document Type: Original Research Article | ||
| DOI: 10.21608/sjfop.2024.397555 | ||
| Authors | ||
| K. E. Attia* 1; Naglaa F.S. Elbohy2; Manal M. Meligy1 | ||
| 1Medicinal and Aromatic Plants Research Department, Horticulture Research Institute, ARC., Egypt | ||
| 2Ornamental Plants and Landscape Gardening Res. Dept., Hort. Res. Inst., ARC, Egypt | ||
| Abstract | ||
| A field experiment was set up at the Experimental Farm of the El-Quassassin Horticultural Research Station, Hort. Res. Inst., ARC., Ismailia Governorate, Egypt, during two winter seasons (2022/2023 and 2023/2024), with the aim to achieve the optimal growth and flowering productivity of marigold (Calendula officinalis L.). Three planting dates (September 15th, October 1st and October 15th) of 2022 and 2023, four combination treatments between nitrogen fertilizer and algae extract (algae extract (AE) at 3 ml/l, nitrogen at 100% of the recommended rate (RR), 50% RR of nitrogen + AE at 3 ml/l and 75% RR of nitrogen + AE at 3 ml/l) and their interaction treatments were tested. The obtained results indicated that the early sowing from September 15th followed by October 1st increased plant height, branches number per plant, fresh and dry weights of herb per plant, number of flowers per plant and flower diameter as well as chlorophyll a and b contents, phosphorus, potassium percentages and flowers fresh and dry weights per plant per season compared to the third planting date under sandy soil conditions. Applying nitrogen fertilization at 100% RR followed by 75% RR + AE at 3 ml/l treatments gave the highest values of abovementioned parameters. In general, planting pot marigold seedlings on September 15th followed by October 1st as well as fertilization with 100% RR of nitrogen or 75% RR of nitrogen + spraying with 3 ml/l of algae extract five times per season manifests to enhance growth, flower yield and chemical constituents of Calendula officinalis under Ismailia Governorate conditions. Also, the highest fresh and dry yield/fed/season were obtained from the combined treatment of growing date on October 1st as well as nitrogen fertilization at 100% RR followed by 75% RR + algae extract at 3ml/l, during the two seasons. | ||
| Keywords | ||
| Calendula officinalis; planting date; nitrogen; algae extract; growth; flowering; chlorophyll | ||
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