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 Direct comparisons between instruments always yield the safest and most highly correlated data. Gravimetric sampling is accurate but has too many error factors via sampling and the like. Tools such as the Diviner, Enviroscan, Neutron probes etc are good in that they provide accurate repeateable data from a site, but the number of sites is usually limited by cost. Simple effective tools such as Watermarks and the EC type probes may not be as accurate, but to a grower they offer a cheap tool to do scheduling, especially at the stages. As most growers tend to be view irrigation scheduling as more of an irritant, with set times based on intervals between dinner and supper with a bit if an allowance for dessert, anything is a step up. Hopefully I intend to use the Diviner to provide a greater amount of data thru the profile than I can with the Watermarks to allow a more "site-specific" tuning of the system based on rooting depth and soil characteristic at mangement zones thruout the field. I appreciate your running of this list as I do all the list mgrs. It makes jobs like mine quite a bit easier than having to rummage thru the library only to find articles from 1964. 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