There are several documents which advise farmers on how to fertilize their land, mainly to prevent pollution to water courses. The documents do however include sections about how to limit odour problems as well as other matters such as fly problems and pollution of water courses
The Air Code
The Soil Code
The Water Code
Safe Sludge Matrix
Code of Practice for Agricultural Use of Sewage Sludge
Code of Practice for the Use of Poultry Manure