I've just found a source for free composted horse manure, there is a
horse farm about 1/2 mile from me that gives it away. They have a big
compost pile, you just have to drive up with some containers and take as
much as you want.

I have a few questions about it's usage.

1) Is it good for everything or should I just put it on some crops? I
grow strawberries, blueberries, tomatoes, carrots, parsnips, cucumbers,
peas, broccoli, spinach and cord.

2) Should I work it into the soil as a soil conditioner?

3) Can I use it as a mulch?

4) How much is too much?