System for optimum irrigating and fertilizing

Details System for optimum irrigating and fertilizing System for optimum irrigating and fertilizing

1985-02-25

1985-10-08

Chambers, A. Michael

Fluid handling

Ambient condition change responsive

For controlling soil irrigation

239 64, 239 69, 239310, F16K 1736

Patent

active

045453969

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.

REFERENCES:
patent: 3669357 (1972-06-01), Overbey
patent: 4176395 (1979-11-01), Evelyn-Veere et al.
patent: 4209131 (1980-06-01), Barash et al.
patent: 4396149 (1983-08-01), Hirsch
patent: 4456176 (1984-06-01), Agius

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