Soil moisture sampler and controller

Details Soil moisture sampler and controller Soil moisture sampler and controller

1977-09-19

1980-04-15

Schwadron, Martin P.

Fluid handling

Processes

73 75, 137 78A, 239 63, 239 75, 324 65R, A01G 2516

Patent

active

041978668

ABSTRACT:
Periodically, the soil moisture sampler and controller automatically activates in-ground probe(s) to measure the soil moisture. The resulting output signal indicative of the soil moisture is adjusted for soil ambient temperature and compared to a pre-set soil moisture value. When the signal indicates that the soil moisture is less than a pre-set value, an irrigation timer is activated which causes the soil to be irrigated for a preselected time interval.

REFERENCES:
patent: 2718141 (1955-09-01), Richards
patent: 3626286 (1971-12-01), Rauchwerger
patent: 3777976 (1973-12-01), Milovancevic
patent: 3847351 (1974-11-01), Hasenbeck
patent: 3882383 (1975-05-01), Matlin
Phene, C. J. et al. Controlling Automated Irrigation with Soil Matric Potential Sensor, Trans. Amer. Soc. Agr. Eng., vol. 16, No. 4, 773-776, 1973.
Phene, C. J. et al. Measuring Soil Matric Potential in situ by Sensing Heat Dissipation Within a Porous Body: II. Experimenta Results, Soil Sci. Amer. Proc., vol. 35, No. 2, Mar.-Apr., 1971.
Phene, C. J. et al. Controlling Automated Irrigation with a Soil Matric Potential Sensor, U.S. Salinity Laboratory, Riverside, Calif. (published prior to Jul., 1976).
Phene, C. J. et al. Measuring Soil Matric Potential in situ by Sensing Heat Dissipation Within a Porous Body: I. Theory and Sensor Construction, Soil Science Society of America Proceedings, vol. 35, No. 1, Jan.-Feb. 1971.
Watertech Brochure, 1976, 6 pages (Model 2002B on cover) Watertech, Trinity, N.C.
McCune-Neal Brochure for Matric Potential Sensor Probes 1001A, 1002A, 1971, High Point, N.C.
McCune-Neal Brochure for Matric Potential Measurement System 2002A, 1971, High Point, N.C.

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