Fahmy, A., Hassan, H. (2020). Enhancing Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant by Using Ascorbic Acid under Different Potassium Fertilization Levels تحسين نمو وإنتاجية نبات الکرکديه باستخدام الرش الورقي بحمض الأسکوربيک تحت مستويات مختلفة من التسميد البوتاسى. test, 11(10), 893-898. doi: 10.21608/jpp.2020.123966
Asmaa Fahmy; H. M. S. Hassan. "Enhancing Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant by Using Ascorbic Acid under Different Potassium Fertilization Levels تحسين نمو وإنتاجية نبات الکرکديه باستخدام الرش الورقي بحمض الأسکوربيک تحت مستويات مختلفة من التسميد البوتاسى". test, 11, 10, 2020, 893-898. doi: 10.21608/jpp.2020.123966
Fahmy, A., Hassan, H. (2020). 'Enhancing Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant by Using Ascorbic Acid under Different Potassium Fertilization Levels تحسين نمو وإنتاجية نبات الکرکديه باستخدام الرش الورقي بحمض الأسکوربيک تحت مستويات مختلفة من التسميد البوتاسى', test, 11(10), pp. 893-898. doi: 10.21608/jpp.2020.123966
Fahmy, A., Hassan, H. Enhancing Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant by Using Ascorbic Acid under Different Potassium Fertilization Levels تحسين نمو وإنتاجية نبات الکرکديه باستخدام الرش الورقي بحمض الأسکوربيک تحت مستويات مختلفة من التسميد البوتاسى. test, 2020; 11(10): 893-898. doi: 10.21608/jpp.2020.123966

Enhancing Growth and Productivity of Roselle (Hibiscus sabdariffa, L.) Plant by Using Ascorbic Acid under Different Potassium Fertilization Levels تحسين نمو وإنتاجية نبات الکرکديه باستخدام الرش الورقي بحمض الأسکوربيک تحت مستويات مختلفة من التسميد البوتاسى

Journal of Plant Production
Article 2, Volume 11, Issue 10, October 2020, Pages 893-898    PDF (849.78 K)
Document Type: Original Article
DOI: 10.21608/jpp.2020.123966
Authors
Asmaa Fahmy* 1; H. M. S. Hassan2
1Department of Horticulture, Faculty of Agriculture, Zagazig University, Egypt.
2Department of Plant Production, Fac. Environ. Agric. Sci., Arish Univ., Egypt.
Abstract
Two experimental fields were conducted during the two consecutive summer seasons of 2018 and 2019 at the Experimental Farm of Fac. Agric., Zagazig Univ., Egypt, to study the effect of potassium fertilization levels (0.0, 24, 48 and 72 kg K2O/feddan), ascorbic acid concentrations (0.0, 150 and 300 ppm as foliar spray) and their interaction treatments on vegetative growth parameters, yield components and chemical constituents in calyxes of roselle plants. The obtained results indicated that the highest level of potassium fertilization (72 kg K2O/feddan) gave the highest values of plant height and branch number per plant and total dry weight per plant compared to the other two levels and control. In addition, the yield components of roselle plants (number of fruits per plant as well as sepals and seed yield per plant and per feddan) and chemical constituents (total chlorophyll content in leaves, anthocyanin content, total soluble solids, nitrogen, phosphorus and potassium percentages in calyxes) Moreover, foliar spray with 150 and 300 ppm of ascorbic acid recorded the highest values of abovementioned parameters with significant difference between them compared to control (unsprayed plants). In conclusion, it could recommend that 72 kg K2O/feddan level interacted with 300 ppm ascorbic acid, reveals a uniform effect in enhancing of growth and yielding of roselle plants compared to the other interaction treatments under study. 
Keywords
Hibiscus sabdariffa; potassium fertilization; ascorbic acid; Growth; yield and Chemical constituents
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