GROWTH AND PHOTOSYNTHETIC EFFICIENCY OF Atriplex nummularia UNDER DIFFERENT SOIL MOISTURE AND SALINE TAILINGS

Authors

  • Aline Sheyla Leal de Oliveira Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE http://orcid.org/0000-0001-9955-6516
  • Eduardo Soares de Souza Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE http://orcid.org/0000-0002-5488-5284
  • Luiz Guilherme Medeiros Pessoa Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE http://orcid.org/0000-0003-1937-526X
  • Sérgio Luiz Ferreira-Silva Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE http://orcid.org/0000-0003-3055-3258
  • Rodolfo Marcondes Silva Souza Department of Nuclear Energy, National Observatory of Water and Carbon Dynamics in the Caatinga Biome, Universidade Federal de Pernambuco, Recife, PE http://orcid.org/0000-0001-7551-0505
  • Antonio Celso Dantas Antonino Department of Nuclear Energy, National Observatory of Water and Carbon Dynamics in the Caatinga Biome, Universidade Federal de Pernambuco, Recife, PE http://orcid.org/0000-0002-4120-9404

DOI:

https://doi.org/10.1590/1983-21252019v32n222rc

Keywords:

Photosynthesis. Halophyte. Water reuse. Salinity.

Abstract

The disposal of the tailings (wastes) from desalinators is a growing problem, especially in semi-arid regions, and it is necessary to study halophytes such as Atriplex nummularia for the reuse of these saline waters. Thus, the objective of this study was to evaluate the effect of the interaction between levels of soil water content and salinity of irrigation water, gas exchange and growth of Atriplex nummularia Lindl. The plants were cultivated in vases with soils under two moisture levels (50 and 100% of the field capacity) and irrigated with saline waters from dilution of the desalinator waste, to obtain the following electrical conductivities (EC) of 0.39; 1.54; 2.15; 2.79; and 3.63 dS m-1. The experiment was conducted in a greenhouse for 160 days, with a triple factorial arrangement of 2x5x3, in a randomized complete block design with four replications. The photosynthetic, biometric and plant biomass parameters were evaluated. Irrigation with saline water reduced the net photosynthetic rate (A), stomatal conductance (gs), the effective quantum yield of photosystem II (ΔF/Fm’), photochemical quenching (qP) and the electron transport rate (ETR) of the plants for the two conditions of soil moisture. However, it did not impair the efficiencies of water use (WUE) and carboxylation (EIC) of plants. Plant growth rate and leaf biomass were stimulated under irrigation with saline water (EC ≤ 3.63 dS m-1), and when associated with soil moisture of 100% FC leaf biomass gains > 100% were obtained.

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Published

21-05-2019

Issue

Section

Agricultural Engineering