Some of these may have factsheets and other information on their websites. Some groups, if you chose to join, may offer locallly relevant information via meetings, newsletters etc. If you live in Qld, see also the Events Diary
because some groups may have shows, open dyas, workshops etc events listed there
Assorted articles plus "Organic News" newsletter. NSW Department of Primary Industries
The Organic Federation of Australia
Edible Plants and Gardening (various)
Many of these site have extensive archives of information, so take the time to explore. As with any website, try the search facility (if one is provided) to look for a specific topic.
Online Resource by Center for New Crops & Plant Products, Purdue University
An organisation helping people in developing countries overcome hunger. Lots of information on crops and techniques for difficult conditions at their website
If you live in a hot climate, appropriate information about vegetable growing can be hard to find, especially if you have to live with watering restrictions as well. More about vegetables with an emphasis on tropical and subtropical climates here: Queensland Gardening Pages - Vegetables
There's also extensive material about the most commercially important vegetable crops online (use your favourite search engine) as well as in books and magazines.
The websites of your own state/national department of agriculture and/or university extension service may have information of particular relevance to your region.
Some of the sites in the "general" category above may also discuss vegetable growing.
Fruits and Nuts
More links about fruit and nuts of particular relevance to residents of hot climates here: Queensland Gardening Pages - Fruit and Nuts
If you live in temperate to cool climates, there's extensive information on fruit and nuts crops online via search engines plus books and magazines. As per vegetables, be sure to check the resources listed at the top of the page as well as the websites of your own state/national department of agriculture and/or university extension service.
Culinary herbs covered in more detail here: Queensland Gardening Pages - Herbs. Companion Planting is included on the Pests and Diseases page.
Nitrogen fixation, Green Manures, Cover Crops
Other useful plants, Multipurpose plants
Non-wood forest products 10, Food and Agriculture Organization of the United Nations (FAO). Discusses uses of various palm products around the world
Soils - other
The emphaisis here will be unusual or hard-to-find information because you're sure to find masses of information about chickens and other poultry via your favourite search engine. Also check the websites of your own state/national department of agriculture and/or university extension service for information relevant to your area.
, "more than you ever wanted to know about eating bugs" (Not an Australian site, but food for thought!)
Arid Lands Newsletter
Office of Arid Land Studies, University of Arizona, USA. Explore the archives for articles on farming and gardening in arid lands around the world.
More to come in future updates...