Microirrigation: This term refers to any type of irrigation system that delivers small amounts of water directly at or near the root zone.
Subsurface Drip Irrigation (SDI): This term refers specifically to drip irrigation systems where tubing is buried underground, delivering water directly below the soil surface.
Water Use Efficiency: This term refers to how effectively water is used for crop production, taking into account factors like evaporation losses and plant uptake.