Antioxidant contents of bell pepper and melon fruits grown in soil amended with recycled waste

Abstract

Composting and land application of municipal sewage sludge (SS) and yard waste (YW) compost are increasingly popular ways for using organic waste as a source of organic matter, while decreasing the amount of waste being diverted into landfills. Researchers have largely ignored the effect of SS and SS mixed with YW (SS+YW) compost on the antioxidant contents of vegetables grown under this practice. Accordingly, the main objective of this investigation was to monitor the impact of SS and SS+YW on the nutritional composition of pepper and melon fruits at harvest. Total phenols and ascorbic acid contents of pepper and melons (determined by the Folin-Ciocalteau and the dichlorophenol–indophenol methods, respectively) were greater in pepper than melon fruits. Soil amended with SS or SS+YW significantly elevated the concentrations of ascorbic acid and total phenols in melon fruits compared to no-mulch native soil. The application of SS did not modify the concentration of β-carotene in melon fruits at three harvests. Regardless of soil treatments, ascorbic acid and total phenols concentrations were greater in melon fruits collected at the first harvest compared to harvest three. Pepper fruits collected at harvest three contained the greatest concentrations of ascorbic acid and total phenols; whereas, pepper fruits collected at the second harvest contained the greatest concentrations of soluble sugars.