Abstract
The electrical conductivity and of cations (Ca2+, Mg2+, Na+ and K+) and anions (Cl-, CO32-, HCO3- and SO42) contents of the water an Amazon well, from State University of Paraíba, Catolé do Rocha city, Paraíba State, Brazil, located in the semi-arid region of the Brazilian High Sertão were evaluated monthly from January to December of year 2017. Despite the increase in electrical conductivity from 0.89 to 1.16 mS cm-1 and sodium adsorption ratio (SAR) from 4.43 to 10.45 (mmol L-1)1/2 did not change the water quality to agriculture. With mean risk to saline (C2) and low risk to exercise sodicity at soil (S1), toxicity and nutritional imbalance to plants, the concentration of dissolved salts increased from 0.57 to 0.74 g L-1 between rainy and arid periods. This situation expresses a high increase of almost 30% in the total dissolved salts during the evaluated period and shows the need for systematic monitoring. Simulating the irrigation with a 400 mm blade of this water with 1.16 dS m-1, in 120 days, can add to soil 2,970 kg ha-1 of salts, of which 1,892; 633; 258 and 143 kg ha-1 are of the sodium, calcium, potassium and magnesium species, respectively. Key words: Water quality, ionic components of water, salinity of water in well.  
Highlights
Agriculture, in Brazil and worldwide, is the activity that consumes the most water in comparison to the consumption of human, herds and industrial (Oliveira et al, 2013; Holanda et al, 2016)
Simulating the irrigation with a 400 mm blade of this water with 1.16 dS m-1, in 120 days, can add to soil 2,970 kg ha-1 of salts, of which 1,892; 633; 258 and 143 kg ha-1 are of the sodium, calcium, potassium and magnesium species, respectively
The electrical conductivity in the period from January to December/2017 increased from 0.89 to 1.16 dS m-1 resulting in a saline increase of 30.3%; this value is considered high and already uses moderate restraint (Ayers and Westcot, 1999; Medeiros et al, 2003; Almeida, 2010, Cavalcante et al, 2012, Holanda et al, 2016) the great importance economic cultivated plants
Summary
Agriculture, in Brazil and worldwide, is the activity that consumes the most water in comparison to the consumption of human, herds and industrial (Oliveira et al, 2013; Holanda et al, 2016). Beyond the quantitative aspects (regular rainfall and volume of water available), in agriculture, the world needs chemical quality water that allows the use in the irrigation without causing high edaphic degradation and high cultures production losses (Cavalcante et al, 2012; Ganiyu et al 2018). In addition to these inconveniences, the surface and groundwater salt content in semi-arid areas, which is generally above the limits tolerated by plants to human food and animals importance, results in a serious.
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