I have horses and an abundant supply of manure. I hot compost the
manure, turning frequently, until it is no longer heating.

My question is, is this a good source of fertilizer, (nitrogen, et.
al.), for my veggie garden? I'm fairly new to gardening but my plants
look rather weak and yellow. I started the garden with lots of
compost but didn't add any other fertilizer. Is compost enough or
not?