PhD Oral Defense: Chemical properties of organic amendments influence nitrous oxide emissions from agricultural soils
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PhD Oral Defense of Ana茂s Charles, Natural Resource Sciences.
Prediction of organic amendment (OA) potential to emit soil nitrous oxide (POA-N2O) is difficult because of variable composition of OAs and of complex interactions with soil properties and environmental conditions.
The objectives of this thesis were (1) to conduct a meta-analysis of on-field N2O emissions following OA application to agricultural soils to assess global emission factor (EF) for all organic sources, EForg, and its modulation by environmental and management-related factors; (2) to determine how experimental conditions affect the POA-N2O and select optimal conditions for assessment; (3) to measure the immediate (P1), short- (P2) and medium-term (P3) POA-N2O with the selected incubation method and then, relate P1, P2, and P3 to the physico-chemical characteristics of more than 131 OAs.
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