Irrigation systems can also be automated through information
on volumetric water content of soil, using dielectric moisture
sensors to control actuators and save water, instead of a predetermined
irrigation schedule at a particular time of the day
and with a specific duration. An irrigation controller is used
to open a solenoid valve and apply watering to bedding plants
(impatiens, petunia, salvia, and vinca) when the volumetric
water content of the substrate drops below a set point [6].