According to an article entitled "Good Poop, Bad Poop" chicken manure has more than triple the nitrogen of dairy cow manure, three times that of steer manure and double sheep manure.The analysis is generally N: 1.1, P:.80 and K: .50. Dairy cows by contrast are N: .25, P: .15 and K. .25. (Only rabbit manure is higher in N content with 2.4). The article also noted that "Poultry manure (chicken in particular) is the richest animal manure in N-P-K. Chicken manure is considered "hot" and must be composted before adding it to the garden. Otherwise, it will burn any plants it comes in contact with."
http://www.plantea.com/manure.htmThe field was green so I am assuming the manure was at least partially composted.
