I have always used horse manure ( I have a rather steady supply) When I clean the paddocks I use the tractor to push all the manure along the outside of the pen, after it "dries" we got back and load it all into the trailer, then we spend the day filling all the water holes around each tree, vegie etc full of manure.. When you water it basically makes a "tea" .. When I plant something weather its a tree or a flower I always include the manure in the plant hole... I water each tree with ahose so if you use a drip you could still use the manure in the hole theory but it wouldnt be as good...
Arley basically you want the manure to dry out... Dont use the fresh green mooshy piles.....One it will burn the plant, 2 it stinks and Im not sticking MY Hands in fresh doo. LOL
I perfer horse over steer simply because 1. I have horses therefor its free, and 2 horse manure doesnt stink like cow manure does...
I use it on everything, I even sprinkle it over my yard ... WHich by the way you will smell it when it is watered.... But its still better than cow manure smell....