Plant husbandry – Water culture – apparatus or method – Nutrient recirculation system
Patent
1977-01-27
1978-08-22
Eickholt, E. H.
Plant husbandry
Water culture, apparatus or method
Nutrient recirculation system
47 18, A01G 3100
Patent
active
041078756
ABSTRACT:
An assembly for supplying a nutrient solution, such as water, to plants supported on a greenhouse bench, which retains the solution supplied thereto from a reservoir disposed immediately beneath the bench. A main source of liquid, such as water, is supplied through a main valve to a float-operated valve within the reservoir for maintaining a predetermined level of the solution within the reservoir. Also included is a fluid line interconnecting the bench and a pump disposed within the reservoir whereby the solution may be pumped to the bench through a check valve in the line and which prevents reverse flow. Also attached to the line is a solenoid actuated drain valve which drains the solution from the flooded bench and back into the reservoir. A control timer controls the operation of the main valve and the pump and the solenoid actuated valve to close the main valve and, thereafter, actuate the pump for pumping the solution from the reservoir to the bench for a predetermined period of time after which the solenoid valve is opened to drain the bench back into the reservoir whereupon the main valve is opened allowing the reservoir to be replenished through the float-operated valve. A reservoir is associated with each bench and a plurality of reservoirs are supplied liquid from the main valve whereby the solution in each reservoir bench combination or pair is isolated from the solution of every other reservoir bench combination or pair.
REFERENCES:
patent: 2060735 (1936-11-01), Krueger
patent: 2062755 (1936-12-01), Lyons et al.
patent: 2150257 (1939-03-01), Winandy
patent: 2486512 (1949-11-01), Armstrong
patent: 2747331 (1956-05-01), Steiner
patent: 2880549 (1959-04-01), Knipe
patent: 3131064 (1964-04-01), Malchair
patent: 3550319 (1970-12-01), Gaines, Jr.
patent: 3807088 (1974-04-01), Jones
patent: 3925926 (1975-12-01), Shigeo
patent: 3992809 (1976-11-01), Chew
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