Land application of manure generates more odour complaints than any other stage in livestock production. Livestock odours have been found to be complex and challenging to accurately measure in field environments. For land applied manure management strategies to be implemented, odours generated in the field must be accurately quantified. The objective of this research was therefore to quantify odour emissions from surface applied swine manure using olfactometry and assess and evaluate a theoretical profile shape (TPS) micrometeorological approach in combination with olfactometry for odour flux field assessments. Liquid and solid manure application rates of 100, 200, and 500 kg of NH4-N/ha, as well as the effect of rainfall before and after manure application, were evaluated. Liquid manure initially generated higher odour emissions; however, odour emissions from solid manure persisted for longer. Increased application rates and applying manure after a heavy rainfall generally produced higher emissions; applying manure before a rainfall event, however, reduced emissions. The TPS micrometeorological approach for measuring emissions in the field is a valid flux measurement approach, which is well suited to olfactometry due to the limited fast response systems available. Olfactometry, however, continues to be the challenge and is not a highly sensitive method of measurement in field conditions. There is a need for improvements in fast response odour assessments. Future investigations with these methodologies, such as the electronic nose, may provide a good comparative method for olfactometry studies
and continuous flux measurement.