ENHANCING GROWTH, YIELD, AND QUALITY OF OKRA BY FOLIAR APPLICATION OF SALICYLIC ACID AND CHITOSAN UNDER SALT STRESS | ||
| Journal of Agricultural and Environmental Sciences | ||
| Volume 24, Issue 2, August 2025, Pages 136-169 PDF (857.74 K) | ||
| Document Type: Full research articles | ||
| DOI: 10.21608/jaesj.2025.393349.1271 | ||
| Authors | ||
| S Gabr; Sary Hassan Brengi* ; M M Abdel-Halim; R E Shehata | ||
| Department of Horticulture, Faculty of Agriculture, Damanhour University, El-Beheira, Egypt | ||
| Abstract | ||
| Two pot experiments were conducted on a private farm in Abu Hummus region, Beheira governorate, during two successive summer seasons: 2023 and 2024. The study aimed to investigate the effects of either salicylic acid or chitosan in mitigating the adverse effects of salinity on vegetative growth, yield, and chemical composition of okra (Lady’s fingers variety) under different salinity levels. Each experiment included 20 treatment combinations, resulting from four salinity levels (tap water, 1000, 2000, and 3000 ppm) and five foliar spray treatments: salicylic acid (50 and 100 ppm), chitosan (50 and 100 ppm), and distilled water as a control. The experiments were carried out as a randomized complete block design (RCBD) in a split-plot system with three replicates. Whereas the salinity levels arranged in the main plots and (salicylic acid and chitosan) treatments were randomly located in the sub-plots. The obtained results, generally, indicated that increasing salinity levels caused significant reductions in plant height, fresh and dry weight, number of branches and leaves, and leaf area. The lowest mean value was recorded at 3000 ppm, while the highest one was observed under tap water irrigation. Similarly, the number of fruits, fruit weight, and total yield per plant decreased as salinity increased. The contents of nitrogen, carbohydrates, phosphorus, potassium, crude protein, and mucilage in leaves and fruits declined, whereas sodium and chloride concentrations increased. Foliar application of chitosan or salicylic acid improved all measured traits, except sodium and chloride concentrations. The most effective treatment was chitosan at 100 ppm, followed by salicylic acid at 50 ppm. | ||
| Keywords | ||
| Salinity; Okra; Salicylic Acid; Chitosan | ||
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