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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 Clint Shock writes: ===8<============== Weidong Lu, We have used Watermarks in our research to provide signals for automatically allowing irrigations to proceed when needed or to block irrigations when they are not required. Please see http://www.cropinfo.net/granular.htm The city of Boulder, Colorado, has used Watermarks to control landscape irrigation for the last 7-8 years. Bill Pogue of Irrometer could put you in touch with your representative. An alternative technology for your use would be miniature low tension tensiometers with pressure transducers. -- Dr. Clinton C. Shock 1059 SW 2nd Ave. Ontario, OR 97914, USA Telephone (541) 889-7057 http://www.shockfamily.net Email ccshock@fmtc.net 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 > ] ===8<===========