Brackish water can be used to grow salt-tolerant crops, helping farmers make use of otherwise unusable water sources. For example, crops like barley and certain types of tomatoes can thrive with brackish water. Reusing poor quality water in agriculture helps save freshwater and supports sustainable farming. Studies show that reusing wastewater can increase crop yields by up to 15%, which is crucial as climate change makes freshwater scarcer.
I think using poor quality water in agriculture will create problems specially where evaporation rare is high, it may cause increasing salinity of the area.