Plant husbandry – Greenhouse – apparatus or method
Patent
1986-10-16
1989-08-22
Hafer, Robert A.
Plant husbandry
Greenhouse, apparatus or method
47 485, 236 44C, 165 21, B01F 302, A01G 900
Patent
active
048583774
ABSTRACT:
A system for controlling environmental conditions including irrigation or misting in greenhouses having a plurality of crop beds within one greenhouse enclosure arranged into a plurality of sense zones and a plurality of control zones comprises a plurality of sensors stationed over crop beds within each sense zone comprising an aspirated enclosure and means therein for generating analog electrical signals indicative of web bulb and dry bulb temperatures and also means for generating an analog electrical signal indicative of incident light over the bed of a microcomputer. The microcomputer is programmed with a task for inputting digital data from the input section indicative of web bulb and dry bulb temperatures and for calculating the vapor pressure deficit over each bed and for inputting digital data from the input section indicative of light intensity; a task for measuring a parameter indicative of physiological crop age; a task for establishing a time interval between supply of water based upon the gathered data; and a task for initiating electromechanical action for supplying water to the crop bed.
REFERENCES:
patent: 4211037 (1980-07-01), Green
patent: 4430828 (1984-02-01), Oglevee et al.
patent: 4755942 (1988-07-01), Gardner et al.
"Effect of Different Irrigation Methods and Levels on Greenhouse Muskmelon" by A. Borelli et al., ACTA Horticulturea 58/1977, pp. 129-135.
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"Mist Controller Plus"--Oglevee Computer Systems Operation Manual.
"The Process of Transpiration" by Paul J. Kramer, Water Relations of Plants, Academic Press 1983, pp. 294-297.
"Canopy Temperature as a Crop Water Stress Indicator", R. D. Jackson, S. B. Idso, R. J. Reginato and P. J. Pinter, Jr., Water Resources Research, vol. 17, No. 4, pp. 1133-1138, Aug. 1981.
"Remote-Sensing of Crop Yields Canopy temperature and albedo measurements have been quatitatively correlated with final harvests of wheat", Sherwood B. Idso, Ray D. Jackson, Robert J. Reginato, Science, vol. 196, Apr. 1, 1977, pp. 19-25.
"A Generalization of the Stress-Degree-Day Concept of Yield Prediction to Accommodate a Diversity of Crops", S. B. Idso, R. J. Reginato, J. L. Hatfield, G. K. Walker, R. D. Jackson and P. J. Pinter, Jr., Agricultural Meteorology, 21 (1980), 205-211.
Oglevee James R.
Oglevee Kirk A.
Hafer Robert A.
OCS, Inc.
Thompson Jeffrey L.
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