Subsurface drip irrigation from NutraDrip in action! Answers to FAQ below:-What is SDI? Subsurface drip irrigation is buried drip tape a foot below ground that delivers water directly to the root zones of plants. A pump and controller station controls how much water is delivered to each zone of the field. -Why SDI? Drip irrigation is most beneficial in irregular shaped fields that can’t be irrigated by a circle pivot. It is also beneficial when you have limited water, as it is much more efficien