Governorate, Egypt during the two consecutive summer seasons of 2019 and 2020, with the aim to evaluate the effect of vernalization and some organic acids (citric and ascorbic acids) on roselle (Hibiscus sabdariffa L.) plants. The combined treatments were as follows, NPK 100% only (cont.) + vernalization (T1), cont. + nonvernalization (T2), ascorbic acid in addition to NPK 50% (AA) + vernalization (T3), AA + non-vernalization (T4), citric acid in addition to NPK 50% (CA) + vernalization (T5), CA + nonvernalization (T6), AA + CA + vernalization (T7), AA + CA + nonvernalization (T8). It was found that the effect of vernalization and some organic acids on plants gave highly significant values compared to control on all tested vegetative growth traits and chemical measurements. The best spraying treatments were recorded by citric acid on most vegetative measurements i.e. plant height (cm), weight of 100 seeds (g), fixed oil % etc. The vernalization recorded the best results on all parameters under study. Regarding the combined treatments between these two factors, the highest values of the studied characteristics (vegetative growth traits, fixed oil % and the organic acid i.e. stearic and linoleic acids) were obtained by T7 and T5. In general, applying T7 (ascorbic + citric acids (in addition to NPK 50%) + vernalization) is recommended to obtain the best results for the most studied measurements of roselle.
The current study was conducted at the Agricultural Research Center farm at the Agricultural Research Station at Gemmayzeh, Gharbia Governorate, Egypt, during the two consecutive summer seasons 2017 and 2018, with the aim of evaluating the effect of Citric acid treatments (2 and3 g/L) and Potassium humate (2and 3g /L) on the early flowering of the hibiscus (Hibiscus sabdariffa L.) plant, the treatments were as follows (T1) control (spray with water) and (T2) Citric acid (2g/L) and (T3) Citric acid (3g/L), (T4)Potassium humate (2g /L), (T5) Potassium humate (3g /L), (T6) Citric acid (2g/L) +Potassium humate (2g/L) and (T7) Citric acid (2 g /L) + Potassium humate (3 g /L) and (T8) Citric acid (3g/L) +Potassium humate (2g /L) and (T9) Citric acid (3g /L) + Potassium humate (3g /L). It was found that the foliar spraying of the two acids, either alone or together, had a positive effect on all growth factors, sepals yield and oil. The interaction treatments were better than the solo treatments and the best of them was the ninth treatment which is Citric acid (3 g/L) + Potassium humate (3g /L), which gave the best results in early flowering and most of the growth and production characteristics of sepals, seeds, oil yield and Vitamin C. Therefore, it is recommended to use a mixture between Citric acid and Potassium humate for early flowering, harvesting and drying before Winter season. Therefore, the main goal of this study to elucidate the effect of foliar spraying with organic acids such as Citric acid and Potassium humate on the early flowering, growth factors, sepals yield and oil of the hibiscus (Hibiscus sabdariffa L.) plant.
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