The trees in the background are a 65' wide wildlife travel corridor. It also functions as a windbreak.
The dark lumps are packages of fertilizer graciously deposited by my cattle. They liked the windbreak.
Looking east from the highest elevation there is very little fertilizer.
Three very excited employees promising me that they will spread fertilizer where it is needed.
Next week, I intend to place another bale of hay forty feet east of this one.
There are trade-offs. Potatoes can become "scabby" if there is too much fresh manure added.
Root vegetables and greens should be cooked before eating.
The ground is soft this time of year. There will be some compacting of the soil. That will be off-set by the action of the worms that will be feeding on the fertilizer.
A big round-bale of hay is nominally 800 pounds and first-cutting, mostly grass hay probably averages 12% protein or about 2% nitrogen. Mostly alfalfa would be closer to 20% and 3.5% respectively. That means each 800 pound bale of hay brings 16 pounds or 28 pounds of nitrogen respectively to the garden.
Not all of the poop and pee will land on the garden, but much of it will since the cattle will "loaf" on the hay they trample and lighten-their-load when they stand up.
If my target is to add 200 lb of supplemental nitrogen per acre, that means I need 25 pounds actual nitrogen. 16 pounds of nitrogen per bale X 2 bales...minus the inevitable losses means that two bales is about the right amount for 5400 square feet of garden for corn, potatoes and other heavy feeders.