Here are a number of websites that provide information about Writing in the Disciplines.
http://www.unc.edu/depts/wcweb/handouts/index.html click on Writing for Specific Fields
http://writing.umn.edu/tww/WID/WIDindex.html
http://mendota.english.wisc.edu/~WAC/disciplineIndex.jsp
http://www.indiana.edu/~wts/cwp/lib/libdir.html
http://www.ag.iastate.edu/grants/home.html focuses on agriculture