You can then form your own program. Manure - well composted of course. The mainstay of the organic garden, I have used both horse and cow manure and find them both effective although horse may be a little better. Manure feeds the soil's microorganisms which break down the manure into humus and other products which can be absorbed by the plant roots. It supplies various macro and micro nutrients necessary for proper plant growth.
Manure also feeds the earthworms which are important for soil aeration.
While it does not have a particularly high nitrogen content, the organic matter feeds soil microorganisms that release nitrogen and thus it's also effective when applied as a fertilizer. Rabbit manure is harder to come by but has the highest nitrogen content of all manures. Humic Acid - this substance, called 'liquid compost' by some, is an excellent addition to your garden soil. It is a naturally occurring compound that makes up a significant part of decayed organic matter. There are various sources of Humic Acid.