The irrigation method where water is applied at low volume is _______.

Drip irrigation is characterized by delivering water directly to the base of plants through a network of tubing, pipes, and emitters. This method ensures that water is applied in low volumes, allowing for efficient moisture management in the soil while minimizing evaporation and runoff. It is particularly effective in arid regions and is widely considered one of the most efficient irrigation techniques available.

In contrast, surface irrigation involves the gravitational flow of water over the field surface, which tends to use larger volumes of water. Furrow irrigation is a type of surface irrigation where water is applied in furrows between rows of crops; while it can be efficient, it typically does not operate at the low volume level of drip systems. Sprinkler irrigation, while effective in distributing water over larger areas, also tends to involve higher water volumes compared to drip irrigation. Therefore, drip irrigation stands out as the method that specifically applies water at low volumes, making it the correct choice.