1) sanet-mg for news releases and requests for information
2) sustag-public, which already exists and is gated read/write
to alt.sustainable.agriculture (sanet-mg is also gated to this newsgroup
but in one-way/read-only mode) could be used for discussion. It seems that
the newsgroups sci.agriculture, alt.sustainable.agriculture,
alt.agriculture.misc and sometimes alt.agriculture.fruit have one
or more discussion threads going quite frequently. Newsgroup software
makes it easier to manage/filter discussion traffic than that used for mail;
newsgroups get wider distribution especially when crossposting occurs
thus soliciting feedback from wider audiences - those withous access to
systems with newsgroup feeds can access alt.sustainable.agriculture
via sustag-public (to which sanet-mg is not gated).
Besides, Internet users are beginning to look for and use agriculture
newsgroups, there are four at this time. Sci.agriculture was formed
as a heirarchy, allowing subgroups to follow. Sci.agriculture.beekeeping
has been proposed recently; sci.agriculture.sustainable could follow
eventually; sci.agriculture.waste-management as well.
My point is that newsgroups are much better places for discussion because
of distribution, diversity of feedback and the ability to select only
those articles/threads that you want to read; trn is a classic example
of a full-featured, very fast, threading news reader.