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You are probably sophisticated in this field, so you may already know our results. Between 1985 and 1989 we tested the Scheduler on a number of crops in Malheur County, Oregon. We were able to define conditions where crop temperature could or could not be used to estimate crop water stress and irrigation needs. We developed crop cooling equations and good guidelines for consistent measurements (where possible). A review of the theory, practicalities of measurement, our field results, and the results from elsewhere as were published as follows: Gardner, B.R., D.C. Nielsen, and C.C. Shock. 1992. Infrared thermometry and the crop water stress index. II Sampling procedures and interpretation. J. Production Agr. 5:466-475. Gardner, B.R., D.C. Nielsen, and C.C. Shock. 1992. Infrared thermometry and the crop water stress index. I History, theory, and baselines. J. Production Agr. 5:462-465. I can mail you or other interested SOWACS readers a copy if you do not have access to the Journal of Production Agriculture. Clint -- Dr. Clinton C. Shock Malheur Experiment Station, Oregon State University 595 Onion Ave. Ontario, OR 97914, USA telephone 541-889-2174 http://www.primenet.com/~mesosu Robert Bogner asked on February 5 > bogner@eleceng.adelaide.edu.au > > As an electrical engineer I am involved in seeking methods for sensing > of moisture content of soils in fairly dry regions (wheat-growing) > without making holes or burying sensors. > > We understand that sensors such as capacitive and TDR and neutron can > do the job quite well but require holes or penetration of the soil. > > We seek more-mobile or airborne methods, and recognise that there > appears to be little knowledge of the limits of capacitive or > multi-frequency radar methods. Perhaps the work on these has been not > promising and thus it did not result in publication, or, it is at > pre-publication stage, or, have we missed something? > > Also, I have recently heard about electrokinetic sensing especially > for aquifers, and wonder if this has been explored for moisture > mapping. > > Robert E. Bogner > -------------------------------------------------------------------------- > http://www.eleceng.adelaide.edu.au:80/Personal/bogner/ > > e_mail bogner@eleceng.adelaide.edu.au WATCH THIS > SPACE > Reliable mail: Robert E. Bogner > Professor of Electrical Engineering, > The University of Adelaide, > Adelaide 5005, . > SOUTH AUSTRALIA __ |\ > / |_| \ > Phone +61 8 8303 5589 (answering machine all hours) .' \ > Fax +61 8 8303 4360 OR +61 8 8224 0464 / \ > Home phone +61 8 8332 5549 \ __ / > Time GMT+9h30m in northern hemisphere summer \_.-' *__/ > GMT+10h30m in northern hemisphere winter V > ======================================================================== Harry Whittle wrote on February 5 A product was developed in the '80s by Standard Oil Engineered Materials Company (STEMCOR Corp.) called the "Scheduler TM. This was a plant stress monitor which measured the plant canopy temperature using infrared thermometry. This is somewhat dated info I received from a relative who owned MIKRON, the company that made the infrared thermometers. You may be able to get further information from either of these two companies: Mikron Instrument Company, Inc. P.O. Box 365, Wyckoff, New Jersey 07481 or Stemcor Corp. 6180 Cochran Road, P.O. Box 391316, Solon Ohio 44139 or Standard Oil Engineered Materials Co. P.O. Box 156, Niagara Falls NY 14302 I would be interested in some feedback if you find these sources to be helpful. I'm interested in the subject but haven't had the time or resources to pursue it. Harry Whittle