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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 At 07:14 PM 04/04/2000 GMT, you wrote: >You can be 100% assured that the measure of soil water from the Sentek device >and from the water mark device are NOT the same. I realize that. I also realize that direct comparison at the site offers the best means of correlating the two. My basic question was if the two units "responded the same" to changing moisture conditions ie a response curve of the unit . That is.. speed of sensing, accuracy over the range of soil moisture encountered, etc. I might assume that the Diviner would have a quicker response as it measures soil moisture content somewhat directly, while the Watermarks have to be wetted at the sensing site. >I recommend you get a basic soil physics textbook and read up on it. I did years ago in grad school. I had a rough time but made it thoough OK.....although I still wake up sometimes in a cold sweat. Original Question >> .......without testing through many matric potentials to establish a proper >> curve, how could I be sure that each unit was responding to soil moisture >> in a similar fashion?? > Tom Thomson Northwest Agricultural Consulting 1275 Oak Villa Road tomt@teleport.com Dallas, Oregon 97338 Phone/FAX 503-623-0468 "The only difference between a problem and a solution is that everyone understands the solution." Charles Kettering