Summary
This study evaluated preharvest applications of naphthalene acetic acid (NAA) and the seaweed concentrate Kelpak® on postharvest quality and phytonutrient retention in yellow sweet peppers grown in soilless culture. Both individual and combined treatments reduced weight loss and colour degradation during cold storage, with combined NAA+Kelpak® application particularly effective at retaining ascorbic acid, carotenoids, and total phenols. The findings suggest preharvest plant growth regulator application may extend marketable shelf-life and nutrient quality in sweet pepper for up to 7 days of storage.
Regional applicability
The study was conducted in soilless (hydroponic) systems, which represent a growing production method in the United Kingdom and globally. Findings are likely transferable to UK protected cultivation of sweet pepper, though the specific cultivar, environmental conditions, and commercial storage protocols may differ from UK practice.
Key measures
Weight loss, colour retention, firmness, pH, total soluble solids, ascorbic acid content, carotenoid content, total phenols, FRAP antioxidant activity; storage duration at 7.5°C for 0, 7, 14, and 21 days
Outcomes reported
The study measured effects of preharvest plant growth regulator applications (naphthalene acetic acid, seaweed concentrate Kelpak®, and their combination) on postharvest quality attributes and phytonutrient content of yellow sweet pepper during cold storage for up to 21 days. Key metrics included weight loss, colour degradation, firmness, pH, total soluble solids, ascorbic acid, carotenoids, total phenols, and antioxidant activity.
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