Document Type : Original papers
Authors
1
Department of Horticulture, Faculty of Agriculture and Natural Resources, Aswan University, Egypt.
2
Department of Horticulture (Ornamental Plants), Faculty of Agriculture, Beni Suef University, Egypt
3
Horticulture Department, Faculty of Agriculture and Natural Resources, Aswan University
4
Horticulture Department, Faculty of Agriculture and Natural Resources, Aswan University, Aswan, Egypt
Abstract
Roselle plays a pivotal role in the pharmaceutical and food sectors due to its economic and cultural significance. In response to the challenges posed by climate change, identifying the optimal sowing date for Roselle crop in light with climate change has become crucial in agricultural practices. This study aimed to explore the influence of sowing dates on the nutrients, biochemical content, and quality of Roselle in the newly reclaimed soil of Aswan governorate. Four sowing dates were implemented in this experiment including April 15th, April 30th, May 15th and May 30th. The diverse sowing dates resulted in significant differences in photosynthetic pigments and biochemical components such as total phenols, total flavonoids, antioxidant activity, and vitamin C, along with variations in nutrient content (N, P, K, Ca, Fe, and Zn). Notably, sowing on May 15th consistently yielded the highest values for these traits across both seasons. The results underscore that planting on May 15th enhanced the nutritional and biochemical profile of Roselle, contributing to elevated levels of economic and health-related attributes. Specifically, this sowing date significantly improved the biochemical contents and overall quality of Roselle. Consequently, based on the findings of this study, it is recommended to sow Roselle in the middle of May to augment the pharmaceutical properties and quality.
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