Shannon, I know what you mean about using orgainic fertilizers on edibles, but since I mainly grow citrus because I enjoy their looks, and rarely eat the fruit, I use chemical fertilizers.
But, there's a nursery on Ebay called Sunshine Gardens who deals with organic Citrus fertilizer..I'd look into it. The company has great feedback, and of what I read, people who use their organic fertilizer are quite content.

www.homeharvest.com also sells orgainc foods..I wish you the best, and don't blame you for wanting natural fertilizers if you're going to eat off of it..I do the same w/garden veggies..No fertilizers and definatly NO insecticides..chemically treated that is..Toni

I have about 100 citrus trees and all I ever give them is mulch. The first year with new trees I gave them some manure as well. I add about 12 inches the first two years and about 6 inches every year after that. I mulch out about 2 feet past the drip line. Keep mulch off the base of the tree, back about 2 inches is fine. Just about anything will do, use what is available and looks attractive for your yard.