chicken manure

Just scooped up two large sacks of chicken pellets from a country lane. The farmer had dropped them on Sunday and the wife and I went and collected the spoils today... we must have made a pretty picture filling the sack with it  Anyway it rained a bit last night so it was partially rehydrated today. What would be the approx application rate for this stuff... it was free and I reckon there was probably about 15 - 20kg of the stuff car boot smells a bit wiffy though