QUALITY AND ANTIOXIDANT ACTIVIY OF TOMATO CULTIVATED UNDER DIFFERENT SOURCES AND DOSES OF NITROGEN

Authors

  • John Silva Porto Department of Plant and Animal Science, Universidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA
  • Tiyoko Nair Hojo Rebouças Department of Plant and Animal Science, Universidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA
  • Maria Olimpia Batista Moraes Department of health education, Instituto Federal da Bahia, Eunápolis, BA
  • Marinês Pereira Bonfim Center of Agrifood Science and Technology, Universidade Federal Campina Grande, Pombal, PB
  • Odair Lacerda Lemos Department of Plant and Animal Science, Universidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA
  • José Magno Queiroz Luz Institute of Agricultural Sciences, Universidade Federal de Uberlândia, Uberlândia, MG

DOI:

https://doi.org/10.1590/1983-21252016v29n401rc

Keywords:

Solanum lycopersicum L.. Bioactive compounds. Antioxidant capacity. Ammonium. Nitrate.

Abstract

Tomatoes are an important component of the human diet because they are rich in minerals and antioxidants that sequester free radicals in cells, preventing various disorders that affect human health. Here, we aimed to evaluate the effects of different nitrogen sources and concentrations on antioxidant capacity and physical and chemical quality of tomato fruit. The experiment was conducted in Vitória da Conquista, state of Bahia, Brazil, in the experimental field of Universidade Estadual do Sudoeste da Bahia. The experimental setup included a randomized block design with four replicates in a factorial layout of 3 × 3 + 1 (control), for a total of 40 plots. The three treatments comprised different nitrogen sources (calcium nitrate, urea, and ammonium sulfate), applied in three doses (140, 280, and 420 kg ha- 1). We evaluated firmness, pH, titratable acidity - TA, soluble solid - SS, SS/TA ratio, ascorbic acid, carotenoids, flavonoids, phenolic compounds and DPPH inhibition, were evaluated after samples were harvested. However, increasing concentrations of N adversely affected the acidity and led to an increase in the SS/TA ratio. Increasing the N concentration also reduced the content of bioactive compounds. excluding carotenoids, which consequently impaired antioxidant activity.

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Published

13-09-2016

Issue

Section

Agronomy