Are you gonna move it around? If the manure is spread out it shouldn't be a problem with corn/onions and other high N crops. Some like to till it in. Otherwise if manure is in pile or accumulated you might want to make some tea out of it. The key is dilution with water. A little can go a long way. I get 1/2 of a 5 gallon bucket of fresh Ch.manure and put it in a 50 gal drumful of water overnight, Kelp, some mollasses, then apply liberally to area.
Good luck