Following the application of dairy or swine manure on to grassland, samples of odorous air have been taken
The air temperature during those experiments was relatively low and varied to a range of 0,4 to 1,4 C. The emission evaluation was done during 48h and odour emission stayed high during the first 4 to 5 hours after spreading. The odour rate was higher with the high application rate for this period but later, both application rates produced equivalent emissions.
The experiment were done at low temperature which may not be representative of all conditions.