Document Type : Original Article
Authors
1
Department of Vegetable Crops, Faculty of Agriculture, Cairo University, PO box 12613, Egypt
2
Department of Botany, Faculty of Agriculture, Cairo University, PO box 12613 Giza, Egypt
3
Department of Horticulture, Faculty of Agriculture, Beni-Suef University, PO box 62517, Egypt.
Abstract
This study was performed during the 2023 and 2024 seasons on the Omega F1 hybrid of hot pepper (Capsicum annuum L.) under elevated temperature and conditions of drought was assessed at the greenhouse of the University of Cairo's Faculty of Agriculture. The primary goals of this study were to ascertain how different foliar spray stimulants used affect pepper plants' tolerance to drought and heat. Twelve treatments were included in this experiment, which included combinations of four foliar application treatments and three irrigation water levels. The foliar treatments were dispersed randomly in the sub-plots (potassium Silicate (PS) 200 mgL-1, Salicylic Acid (SA) 270 mgL-1, Mix (potassium silicate (PS) 200 mgL-1, Salicylic Acid (SA) 270 mgL-1) and tap water as control).
Based on the findings, the greatest values for the evaluated growth characteristics (plant height, number of branches) were noted when potassium silicate was sprayed on plants at a concentration of 200 mgL-1, followed by the Mix (potassium silicate (PS), Salicylic Acid (SA)) treatment every 15 days starting from the 30th day after planting, at an irrigation level of 100% of the field capacity, and then at 75 % of the field capacity. However, when plants were treated with a potassium silicate and salicylic acid mixture at 100% field capacity, the greatest values for leaf number and chlorophyll SPAD were observed. 50 % of the field capacity is used for irrigation and tap water (control) as a foliar spray showed the lowest values for all evaluated growth characteristics. Show clearly that the highest increases in proline concentration and ABA in leaves were found when plants were irrigated with 50 % of field capacity combined using tap water (control) during both seasons. Throughout both of the study seasons, the plants were irrigated at 50 % of the field capacity with all spray treatments, PS, SA, and Mix, resulting in the greatest increase in antioxidant content in the leaves comparing to the control (spraying with tap water).
Additionally, it was demonstrated that foliar treatment can produce excellent yields with high physical and chemical quality.
Keywords
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