These systems (drip, trickle, and micro sprinklers) provide water in small volumes and generally provide water to plants with less waste than furrow irrigation. Drip and trickle systems apply water through small holes in small diameter tubes placed on or below the surface of the field. Another type of system, micro sprinklers, supplies water from low-volume sprinkler heads located above the surface. Low flow systems are expensive and their use is generally limited to high-value crops such as vegetables, fruits, and vineyards.