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This study aimed to analyze, by means of geostatistics, spatial variability of water quality indicator parameters for irrigation purposes in a shallow reservoir located in the irrigated perimeter of Lower-Açu, located in Natal semi-arid, and thus generate maps that can guide decision making regarding the management of this resource and indicate changes in 1 Mestranda, PPGMSA/UFERSA. Mossoró Rio Grande do Norte. Email: larissa.nic@hotmail.com Mestrando, PPGMSA/UFERSA. Mossoró Rio Grande do Norte. Email: junior182@outlook.com Doutorando, PPGMSA/UFERSA. Mossoró Rio Grande do Norte. Email: luizengeaa@hotmail.com Mestranda, PPGMSA/UFERSA. Mossoró Rio Grande do Norte. Email: claranivea@hotmail.com Doutor, Professor/UFERSA. Mossoró Rio Grande do Norte. Email: lcalfilho@ufersa.edu.br L. L. N. Ferreira et al. 2350 water quality due to human actions. Physical and chemical parameters were analyzed as: hydrogen potential (pH), electrical conductivity (EC), Sodium adsorption ratio (SAR), hardness and turbidity, the variográficas analysis showed that the variables presented strong spatial dependence of the risk of salinity and sodicity, the tank water has a good quality for use in irrigation, but there are risks of clogging of the irrigation system transmitters, which may cause serious problems for irrigation equipment used in these areas.

DEPENDÊNCIA ESPACIAL DA QUALIDADE DA ÁGUA PARA IRRIGAÇÃO EM RESERVATÓRIO SUPERFICIAL DO SEMIÁRIDO