Atriplex nummularia is a halophyte of great importance in the recovery of saline soils and is considered as a model plant to study biosaline scenarios. This study aimed to evaluate biometric parameters, biomass production and the accumulation of ions in A. nummularia grown under abiotic stresses. Cultivation was carried out in a Fluvic Neosol for 100 days, adopting two water regimes: 37 and 70% of field capacity. Plants were irrigated with saline solutions containing two types of salts (NaCl and a mixture of NaCl, KCl, MgCl₂ and CaCl₂) at six levels of electrical conductivity: 0, 5, 10, 20, 30 and 40 dS m^-1, arranged in a 6 x 2 x 2 factorial with 4 replicates, forming 96 plots. At the end of the experiment, plants were divided into leaves, stem and roots, for the determination of fresh matter (FM), dry matter (DM) and estimated leaf area (LA), besides the contents of Ca²⁺, Mg²⁺, Na⁺, K⁺ and Cl^-. The type of salt did not influence plant growth or biomass production; however, it influenced the levels of Ca²⁺, Mg²⁺, Na⁺ and Cl^- in the leaves and Mg²⁺, K⁺ and Cl^- in the roots. Increase in salinity reduced the contents of Ca²⁺, Mg²⁺, Na⁺, K⁺ and Cl^- for all treatments.

This research studied threshold electrolyte concentration (TEC) of irrigation water and its effect on the infiltration rate of two contrasting soils from Pernambuco state, Brazil. The experiment was conducted in the Soil Chemistry and Salinity Laboratory of Federal Rural University of Pernambuco. Each soil was packed in five Buchner funnels, where one funnel from each soil was submitted to treatment with solution of electrical conductivity (EC) of 0.5, 1.0, 2.0, 4.0 or 8.0 dS m^-1. For each funnel containing soil, an increasing ratio of NaCl to CaCl₂ was applied in a treatment solution to achieve 10 increasing values of sodium adsorption ratio (SAR) from 0 to 100. These solutions were applied through a Mariotte bottle, with a constant hydraulic head of ~2 cm (pressure potential). After a liter of solution had drained, in the flux was collected for a known time interval, until steady state was reached. Darcy’s equation was used to calculate saturated hydraulic conductivity (K_sat) and a mathematical model used to calculate the TEC as a 20% reduction in K_sat. By increasing SAR similar behavior was noted between the two soils, whereby K_sat decreased, although the relativedecrease in K_sat was greater for SAR of 100 in the soil with higher clay content.