Evaluation of organic manure on morphophysiological parameters and compounds with antioxidant activity in chard (Beta vulgaris L.).

Abstract

Objective: evaluate the effect of organic fertilizers on morphophysiological parameters and compounds with antioxidant activity in Swiss chard (B. vulgaris L.) cv. 'Arcoíris' under greenhouse conditions. Design/methodology/approach: A completely randomized design was used with three treatments: T1: Organic fertilizer based on poultry manure (T1 AAC), T2: vermicompost based on coffee pulp (T2 LC) and T3: Chemical fertilization (T3 FQ), with 33 repetitions. Were evaluated: plant height, stem diameter, number of leaves, leaf area, total fresh and dry biomass, chlorophyll A, B, total chlorophyll, carotenoids, total polyphenols, DPPH and yield. An analysis of variance and a Tukey test were used, with a significance level of 0.05%. Results: The best results were obtained for the treatment with organic fertilizer based on poultry manure (T1 AAC), for most of the variables evaluated. The compounds with antioxidant activity and chard quality were influenced by organic fertilizers, with 0.21 mg Eq. Gallic Acid g^-1 tissue fresh (tf) and a total chlorophyll of 19.5 µg▪ g^-1 tf and a yield of 6,150 kg·m². Limitations on study/implications: have evaluated mineral content of this vegetable. Findings/conclusions: The use of organic fertilizers based on poultry manure could be an alternative for nutritional management in this crop.