Nitrate reductase, chlorophyll content, and antioxidant of okra (Abelmoschus esculentus Moench) under organic fertilizer

Abstract

Okra is often considered useful in traditional medicine because it contains secondary metabolites such as alkaloids, terpenoids, and flavonoids and young fruits and leaves are rich in minerals and dietary fiber. The objective of this study was to assess the growth and quality of okra pods at different plant spacing and litter compost dosages. Results showed that plant height, crop growth rate, yield, pod weight and, fruit circumference increased with the increasing dose of N compost. The highest nitrate reductase activity was at 50 cm row spacing and 150 kg N ha-1 interaction. Chlorophyll content at 75 cm row spacing was higher than 50 cm row spacing. Chlorophyll content was higher at 150 kg N than 0 kg N ha-1, 50 and 100 kg N ha-1. Level of antioxidants decreased with the increase of N given both in row spacing of 50 cm and 75 cm.