Electronic Journals
Journals are an excellent source of specific information, and recent information.  Searching across a number of journals is best done using a database like CAB.
Many electronic journals require a paid subscription and entry of a username and password for access. The titles below can be accessed without these requirements:
Journal of Agricultural Science (http://ccsenet.org/journal/index.php/jas/index)- full text access from 2009 via DOAJ (see below)
Journal of Animal Science (http://jas.fass.org/) - free access to all but the last 12 months of this journal’s articles
Journal of Extension (http://www.joe.org/) - free access to this journal form 1978 via DOAJ (see below)
National Geographic (http://ngm.nationalgeographic.com)
Some websites offer free access to more than one electronic journal.  Those listed below are free:
Agzines: a harvest of free agricultural journals (http://usain.org/agzines.html) - a list compiled by US Agricultural Information Network but worldwide in coverage.  Includes newletters and other titles that are not peer reviewed and complements DOAJ.
Asia Journals online (http://asiajol.info/index.php/index/) - access to full text journal articles from six Asian countries.  Browsable, or using a search box.
Directory of Open Access Journals (DOAJ):  http://www.doaj.org/   - lists open access electronic journals across all disciplines and contains almost 250 journals in agricultural and forestry sciences. All the full text of the journal from a certain date is browsable and downloadable. The website includes a search function. The simple search box is found at: 
          http://www.doaj.org/doaj?func=searchArticles
            A simple search on <> resulted in 116 hits – all full text.  The next step would be to   search each journal itself, if you haven’t used a database to provide you with specific        article references.
Highwire - (http://highwire.stanford.edu/cig/search) “the largest archives of free full text articles on Earth...” has a significant agricultural and forestry component.  You can browse by title, create a search or arrange alerting services.  Most journals have a 12 month embargo on  downloading the latest full text articles.