proudly sponsored by
|
archiving of SOWACS proudly sponsored by |
|
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 IRL is the IRRIGATION-L discussion list run by Dr. Thomas-M. Stein. see the hme page: http://www.wiz.uni-kassel.de/kww/projekte/irrig/irrigation-l/irrigation-l_i. html For a good introduction to the various lists avaialble, read Richard Mead's article: http://enso.unl.edu/ndmc/mitigate/mead.htm Both of these links are availailable of the "links" page on sowacs: http://www.sowacs.com/links/index.html Bruce At 18:07 2/12/00 -0200, you wrote: >What is IRL? >Another list? >Please post more details... >Elimoel > >owner-sowacs@aqua.ccwr.ac.za wrote: > >> 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 >> >> [Apologies for cross-posting, but I thought this would be of interest to >> sowacsers. >> (I wonder how many members of IRL are not members of sowacs and vice >> versa?) Bruce] >> >> Very interesting paper with capacitance methods versus evaporation rates. >> We, at the Rural Engineering Department of University of Švora, Portugal, >> have been using capacitance probes for several years to measure soil >> moisture content to schedule and evaluate surface and sprinkler irrigation >> on many crops with good results. >> >> We bought different capacitance probes, one of which is the Enviroscan. >> Unfortunately this last equipment didn't give good results in our soils. >> >> We have layered soils, with a first layer with a sandy loam texture, in >> which the environscans readings are more or less accurate, but within the >> second layer, which has a high clay content, the environscan readings are >> not reliable. >> >> Maybe it could work well within homogeneous soils, but our experience in >> layered soils is not good. >> We tried to calibrate the probe but it was impossible since the equipment >> didnĄt allow us to change the default calibration parameters. >> >> Maybe the new models have being improved and/or other investigators have >> other opinions. >> >> We are still using capacitance based methods which we tested against neutron >> probe measurements with very good results. >> >> Regards >> Luis Silva >> >> ---------------------------------------------------------------------------- >> -- >> Luis Leopoldo Silva >> Universidade de Švora >> Dep. Engenharia Rural >> Apartado 94 >> 7002-554 EVORA >> PORTUGAL >> >> Fax: +351-266-711189 >> telf: +351-266-760800 >> homepage: http://www.der.uevora.pt/~luis/ >> >> ----- Original Message ----- >> From: Peter Broomhall <hortech@ATS.COM.AU> >> To: <IRRIGATION-L@LISTSERV.GMD.DE> >> Sent: Sunday, November 19, 2000 2:34 AM >> Subject: [IR-L] Comparison - Capacitance vs evaporation rates >> >> > Dear Members >> > >> > http://ats.com.au/~hortech/comparison.html >> > >> > Case study of data from two capacitance sensors (EnviroSCAN and C-Probe) >> > versus Plant water requirements as calculated from evaporation data. >> > >> > Regards >> > >> > Peter Broomhall >> >> -- Bruce Metelerkamp ------------------------------------------------------------------------------ +NZ 6 870 6303 Hawke's Bay New Zealand _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/brooz@pobox.com http://pobox.com/~brooz _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/