Quality of Sodium-Saline Soil Drainage Water and its Classification for Irrigation Purposes in the Brazilian Semi-Arid Region

Objective: The objective of this work was to evaluate the quality of water drained from a saline-sodic soil in a semi-arid region, and then classify it for different uses and verify its potential for reuse in agriculture. Theoretical Framework: The research is based on the guidelines for interpreting irrigation water quality and its classification according to the University of California Committee of Consultants, adapted by Ayers and Westcot (1994) and CONAMA resolution 357/2005. Method: Collections were carried out at nine sampling points in a saline-sodic soil and evaluated in six campaign periods from the application of the leaching blade. The parameters evaluated were electrical conductivity, sodium and sodium adsorption ratio. Results and Discussion: The results obtained allowed us to conclude that the water quality parameters analyzed were influenced by the collection time and that the classification of drainage water for irrigation presented four distinct classes, however with a high risk of soil salinization and low risk of sodicity if used for irrigation purposes. Research Implications: The practical and theoretical implications of this research are discussed, providing relevant information on the use of drainage water from irrigated perimeters for irrigation purposes and the potential risk of soil salization. Originality/Value: This study contributes to the literature by presenting an analysis and classification of drainage water from a saline-sodic soil for irrigation purposes in an irrigated perimeter, providing support for limiting the use of this water under the risk of soil salination.