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The analysis of management alternatives is of fundamental importance for the sustainable development of irrigated agriculture in the semi-arid. The present study was developed in an alluvial valley under salinization risk, especially due to the practice of irrigated agriculture, associated to the quality of the available groundwater. The study was developed in a plot cropped with carrots (Daucus carota L.) using trickle irrigation in the beginning of the rainy season. The performance of the irrigation management using moderately saline water (EC = 1.38 dS m-1) was evaluated based on partial leaching of salts, and maintenance of adequate moisture and salt contents in the soil profile. A decrease in the electrical conductivity of soil water was observed in the 0—100 cm depth after irrigation application, especially in the root zone. Numerical simulations of water flow and salt transport in the unsaturated zone were performed. The simulation results reproduced well the field measured pressure heads and salt concentrations. It was verified, through field experiment and modeling, that the incomplete leaching alternative is adequate when compared to complete leaching, considering both salinity of the irrigation water and the crop tolerance to salinity. Incomplete leaching may provide suitable conditions for plant development, at the same time as it saves water used for irrigation

Avaliação de Alternativa de Irrigação Suplementar com Água Moderadamente Salina em Vale Aluvial no Semi-Árido: Experimentação e Modelagem