I side dress with manure, but I also side dress with bone meal, wood ashes, diatomaceous earth and fish meal. With this added at the edges of the plants, they have a choice to use what they need or not.
I also add liquid fish meal emulsion to my sprayer, and when I rinse milk out of containers I save the water, mix it with the fish meal, add some bt and spray my plants weekly: once, I have worms hit, which is now!
I am also organic, and the items listed are for organic gardening.
Talk to your plants.... If your plants talk to you... Run!