Frost killed cover crops induced high emissions of nitrous oxide

Article Environmental Sciences

N2O emissions from decomposing crop residues are strongly linked to their initial soluble fraction and early C mineralization

Gwenaelle Lashermes et al.

Summary: This study found that specific components in residues were related to N2O emissions and the dynamics of ammonium and nitrate in the soil, with residues high in water-soluble components promoting higher N2O emissions.

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

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Article Soil Science

Using frost-sensitive cover crops for timely nitrogen mineralization and soil moisture management

Tom Storr et al.

Summary: Cover crops can help reduce soil nitrate leaching but their impact on nitrogen immobilization and soil moisture availability for cash crops may vary depending on species and termination management. An alternative method using frost-induced senescence in a multi-species cover crop showed increased nitrogen accumulation. However, the subsequent increase in available nitrogen in topsoil could lead to leaching risks, although not observed in the study. Frost-sensitive cover crop species may provide a continuous supply of available nitrogen as they senesce, with potential leaching risks in spring mitigated by early spring crop establishment.

SOIL USE AND MANAGEMENT (2021)

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Review Biodiversity Conservation

Can N2O emissions offset the benefits from soil organic carbon storage?

Bertrand Guenet et al.

Summary: In order to meet the global warming targets set by the Paris Agreement, drastic reductions in greenhouse gas emissions are required alongside large-scale deployment of other climate mitigation strategies. Increasing soil organic carbon (SOC) stocks is an important lever, but it must be considered that this may lead to increased nitrous oxide (N2O) emissions, offsetting some of the climate benefits.

GLOBAL CHANGE BIOLOGY (2021)

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Article Soil Science

Responses of soil microbial community structure and greenhouse gas fluxes to crop rotations that include winter cover crops

Jasdeep Singh et al.

Summary: Crop diversity achieved through prolonging rotation cycles and growing winter cover crops such as winter rye under a no-till system has the potential to alter microbial community composition and mitigate greenhouse gas emissions.

GEODERMA (2021)

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Article Environmental Sciences

Influence of rye cover cropping on denitrification potential and year-round field N2O emissions

Mary E. Foltz et al.

Summary: The study showed that cover cropping can significantly reduce field N2O emissions and late-winter N2O emission peaks are crucial. However, lab assays found that cover cropping increases the potential for denitrification and N2O production.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

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Article Soil Science