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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 wim cornelis writes: ===8<============== dear Mr. Lu, it seems that the Eijkelkamp armeda (Eijkelkamp Agrisearch Equipment) is still not lurking onto the sowacs discussion list, though i have informed them many times about how interesting it is (thanks bruce). i suppose that Eijkelkamp (Giesbeek, the Netherlands) is the closest provider of this kind of equipment for you. i know that they distribute ordinary gypsum blocks and the Watermark soil moisture meter. good luck, wim owner-sowacs@aqua.ccwr.ac.za wrote: > > Dear all, > > I am a student from TUDelft,the Netherlands. My partner and I are doing a > project which develops a system to water office plants automatically.The > soil moisture required by the plants can be divided into three levels: High, > Medium and Low. In this case, we need a soil moisture sensor to keep on > monitoring the moisture level of the soil and decide whether to add water or > not. > > I are thinking of using Gypsum Block Senor, because it is cheap and meet our > requirement(we don't need detailed value of soil moisture but certain ranges > corresponding to three levels). > > What's your suggestion about this selection of Gypsum Block Sensor? Do you > have any better idea in how to implement this system? Please do not hesitate > to let me know. > > And I found that there were not so many Gypsum Block Sensors on the market. > The famous one may be Watermark. Can I buy it in the netherland? If you know > some companies in the netherlands or around sell Gypsum Block Sensor, please > tell me as soon as possible. > > Best regards, > weidong LU > > ===8<=========== > [Bruce comments > Yes, some sort of electronic switch that is triggered to irrigate when > certain threshhold resistances values are met would seem a good way to go... > I'm sure the irrigaters in the list will suggest how to do this > in a practical sense? > Have a look at http://www.sowacs.com/sensors/gypsum.html as well as > the feature article http://www.sowacs.com/feature/mea/mea.html > ] -- =========================================== Wim Cornelis Department of Soil Management and Soil Care University of Ghent Coupure links 653 B-9000 Gent Belgium tel.: +32 (0)9 264 60 40 fax: +32 (0)9 264 62 47 e-mail: wim.cornelis@rug.ac.be http://soilman.rug.ac.be =========================================== ===8<===========