Concept:Irrigation system where water is delivered directly to the root zone through buried pipes.
Explanation:Subsurface irrigation uses perforated pipes placed below the soil surface, in the subsoil layer.
Water passes through the tiny openings in these pipes and seeps slowly into the soil.
This supplies moisture straight to the roots, where plants need it most.
It greatly reduces water loss from evaporation and surface runoff compared to surface methods.
It is not like flooding, sprinkler, or overhead irrigation because those methods apply water above the ground.
Only subsurface irrigation applies water below the surface using underground pipes.
Answer:B. Subsurface irrigation