Abstract: A system for groves, truck farms and the like for automatically irrigating and fertilizing in accordance with the requirements of the soil. A plurality of capacitance sensors are buried in the areas to be irrigated and fertilized. A computer periodically measures the equivalent capacitive reactance of each sensor to obtain an indication of soil moisture and the equivalent resistance of each sensor to obtain an indication of fertilizer levels in the soil. Water pumps and valves and liquid fertilizer pumps are controlled by the computer to operate only when the soil requires.