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Advisor(s)
Abstract(s)
Partial replacement of mineral fertilisers (MF) with animal manures is a good alternative to reduce MF use and
increase both nutrient cycling in agriculture and soil organic matter. However, the adoption of this practice must
not lead to increased environmental impacts. In this two-year study conducted in an apple orchard, MF were
partially replaced with various animal manures, including cattle slurry (CS), acidified cattle slurry (ACS), solid
cattle manure (CsM), or poultry manure (PM), and their impacts on greenhouse gas emission (GHG: CO2, N2O
and CH4) were examined. A control (CTRL) receiving only MF served as the baseline, representing the con-
ventional scenario in orchard fertilisation. Overall, replacing MF with manures increased GHG emissions, with
the magnitude of the impacts depending on the specific characteristics of the manures and the amount of nu-
trients and organic matter applied. Comparing to the CTRL, application of ACS and CS led to higher CH4 and N2O
emissions, while PM application increased both N2O and CO2 emissions. In contrast, replacement with PM and
CsM decreased CH4 emissions. Nevertheless, results varied between the two years, influenced by several factors,
including soil conditions. While acidification showed potential to mitigate CH4 emissions, it also led to increased
N2O emissions compared to CS, particularly in 2022, suggesting the need for further investigation to avoid
emission trade-offs. Replacement with CS (20.49 t CO2-eq ha 1) and CsM (20.30 t CO2-eq ha 1) showed com-
parable global warming potential (GWP) to the conventional scenario (CTRL, 19.49 t CO2-eq ha 1), highlighting
their potential as viable MF substitutes
Description
Keywords
Yield-scaled GHG emissions global warming potential emission factors soil nitrogen manure
Pedagogical Context
Citation
Esteves, Catarina, et al. «Partial Replacement of Mineral Fertilisers with Animal Manures in an Apple Orchard: Effects on GHG Emission». Journal of Environmental Management, vol. 356, abril de 2024, p. 120552. https://doi.org/10.1016/j.jenvman.2024.120552
Publisher
Elsevier