Physiological indices and production of sesame under salt stress and nitrate/ammonium proportions

Authors

  • Adaan Sudario Dias Universidade Federal de Campina Grande
  • Geovani Soares de Lima Universidade Federal de Campina Grande/Centro de Tecnologia e Recursos Naturais. http://orcid.org/0000-0001-9960-1858
  • Lauriane Almeida dos Anjos Soares Universidade Federal de Campina Grande
  • Hans Raj Gheyi Universidade Federal do Recôncavo da Bahia
  • Reginaldo Gomes Nobre Universidade Federal de Campina Grande
  • João Batista dos Santos Universidade Federal de Campina Grande
  • Francisco Vanies da Silva Sá Universidade Federal de Campina Grande

DOI:

https://doi.org/10.14393/BJ-v33n3-36528

Keywords:

Sesamum indicum L., CNPA G3, water scarcity, nitrogen.

Abstract

In semi-arid regions, the occurrence of water with high concentration of salts is common, which compromises the growth and consequently the production of crops. Thus, this study aimed to evaluate the gas exchanges and production of sesame, cv. CNPA G3, irrigated with saline water and fertilized with different proportions of nitrate and ammonium, in an experiment conducted using lysimeters in a greenhouse in the municipality of Campina Grande-PB, Brazil. The treatments were arranged in randomized blocks and analyzed in a 5 x 5 factorial scheme, with three replicates, relative to five levels of electrical conductivity of the irrigation water - ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m-1) and five proportions of nitrate/ammonium - NO3-/NH4+ (200/0, 150/50, 100/100, 50/150 and 0/200 mg of N kg-1 of soil). Irrigation with water of salinity level higher than 0.6 dS m-1 promoted negative effect on gas exchanges and production components of the sesame cv. CNPA G3. Fertilization with N exclusively in the form of NH4+ promoted increment in CO2 concentration and reduction in its assimilation rate and instantaneous carboxylation efficiency. The highest rate of CO2 assimilation, transpiration and instantaneous carboxylation efficiency were obtained when the plants were irrigated with water of 0.6 dS m-1 and fertilization with 200/0 of NO3-/NH4+. Increasing levels of water salinity promoted a decrease in the total seed mass, regardless of the proportion of NO3-/NH4+. The sesame cv. CNPA G3 is classified as sensitive to salt stress from the electrical conductivity of water of 0.6 dS m-1.

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Published

2017-05-24

How to Cite

DIAS, A.S., LIMA, G.S. de, SOARES, L.A. dos A., GHEYI, H.R., NOBRE, R.G., SANTOS, J.B. dos and SÁ, F.V. da S., 2017. Physiological indices and production of sesame under salt stress and nitrate/ammonium proportions . Bioscience Journal [online], vol. 33, no. 3, pp. 610–620. [Accessed6 December 2022]. DOI 10.14393/BJ-v33n3-36528. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/36528.

Issue

Section

Agricultural Sciences