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Groundwater quality monitoring for agriculture irrigated in Catol Do Rocha, Paraba State, Brazil

2018; Academic Journals; Volume: 13; Issue: 44 Linguagem: Inglês

10.5897/ajar2018.13429

1991-637X

Franklin Mesquita Evandro, Ferreira Cavalcante Lourival, Francisco Thiago Coelho Bezerra, Mesquita Alves Jackson, Thyago Aires Souza Jose, Caio da Silva Sousa, Gustavo Antônio, Araújo de Lima Danila,

Groundwater and Watershed Analysis

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.