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Several years ago, Dr. Roy Sachs of University of California did some work on this utilizing an automatic irrigation system driven by soil water potential and controlled by the IRROMETER Model "RA" swithching tensiometer. I do not recall seeing anything published and I believe that Dr. Sachs is now retired. But I have copied here one of his colleagues at the Davis campus, Dr. J. Heiner Lieth, who may have access to some of this information, if you would like to request it from him. We could today do much the same with the WATERMARK sensor and its switching interface (Watermark Electronic Module) to control valve operation based on a preset level of soil moisture status. Hope this is useful to you. Regards, Bill Pogue, President, Irrometer Company Inc. P.S. One of our bulletins on the use of soil moisture measurement in microirrigation systems contains a good bit on how to do this, and can be accessed on the Microirrigation Forum at: http://mif.org/irrom.html In a message dated 12/9/98 10:47:53 AM Pacific Standard Time, owner- sowacs@aqua.ccwr.ac.za writes: << Subj: measurement in irrigated plantations Date: 12/9/98 10:47:53 AM Pacific Standard Time From: owner-sowacs@aqua.ccwr.ac.za Sender: owner-sowacs@aqua.ccwr.ac.za NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Sowacs: I have two questions: 1) I am chasing information about irrigated eucalypt plantations. I am not interested in effluent irrigation. If members are involved in this activity I am interested in further discussion with particular reference to water use and growth rates. As an extension to this question (and the main interest of sowacs) 2) people who are irrigating trees - I am interested in the techniques you use for irrigation scheduling? Information on these questions will be greatly appreciated. regards, brendan george research officer state forests of NSW, Australia >>