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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 In relation to measuring water content when much of the water is tied up in granules. I know conventional TDR will not work - it does not recognise the water in the granules when the water in the medium as a whole has drained to the point where there is no continuous film. I suspect heat dissapation sensors will not work for the same reason. One brand of capacitive sensor DID work. This is not a trivial problem - I would suggest using gravimetric techniques. A related comment. It is a good idea to check the moisture release curve of the poly acrilimide. Many of these materials do not release water until they are at close to wilting point - far to dry to do vegetables any good. Cliff.hignett@soilwater.com.au owner-sowacs@aqua.ccwr.ac.za wrote: > I would like some information on the ideal moisture for seedling germination. > > Tomato and peppers. > > Also which probe would you recommend. > > I am a chemist and am interested in experimenting on optimising growing conditions for seedling germination. > > I am using poly acrylamide water retention granules at about 1% %v/v > > Can you help > > Bernard Irving <bernardirving@hotmail.com> > > [Bruce comments > Assuming these are potted plants, the sensor probe would need to be small > enough to insert into the pot without disturbing the roots too much, > and provide a volumetric readout. > Please provide more information on the application. > I wonder if anyone can comment on the effect of water retention > granules on measured water content?! > > I am sure the various manufacturers will also contact you directly. > Bruce] > -- Cliff Hignett Soil Water Solutions 45a Ormond Avenue Daw Park South Australia 5041 61 (08) 8276 7706 cliff.hignett@soilwater.com.au www.soilwater.com.au