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Cold stress reduces nodulation and symbiotic nitrogen fixation in winter annual legume cover crops

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Abstract

Aims

Growers in northern U.S. regions rely on winter annual legume cover crop symbiotic nitrogen fixation (SNF) to reduce the need for spring fertilization and build soil organic matter. However, cold transitional fall temperatures potentially limit SNF. This study examined the effects of cold temperatures on nodulation and SNF in legume cover crops.

Methods

In a growth chamber experiment, hairy vetch (Vicia villosa Roth), Austrian winter pea (Pisum sativum L.) and crimson clover (Trifolium incarnatum L.) were sown in growth pouches, inoculated with rhizobia, and placed in growth chambers ranging from 5℃ to 20℃ for six weeks. In a field experiment, the same legumes were sown in fall, with destructive sampling at four time points from November to May. In both experiments, plant biomass, nodulation, and SNF was assessed.

Results

In the controlled environment, incrementally lower temperatures negatively affected legume cover crop biomass and nodulation parameters across all species, especially at 5 °C (41°F). Controlled environment results also suggest that optimum temperatures for SNF in cover crop legumes falls in the range of 15 °C to 20 °C. In the field, winter conditions negatively affected legume cover crop productivity, with plant biomass, nodule number, and nodule mass greatest in fall and spring, and lowest in winter. Hairy vetch had the best growth response to spring warming, suggesting it is well-suited to over-winter protected environment production. SNF also decreased during winter and failed to recover by spring cover crop termination.

Conclusions

Winter annual legume cover crops may not experience reduced growth, nodulation, or SNF until temperatures fall below 10℃; this estimate is lower than previously reported for cover crop legumes. These temperatures are typical of cover crop establishment periods, suggesting winter cover crop species selection is critical; the over-wintering performance of hairy vetch makes it a promising option for temperate regions.

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Abbreviations

DAI:

Days after inoculation

N:

Nitrogen

SNF:

Symbiotic nitrogen fixation

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Acknowledgements

We thank the Organic Agriculture Research and Extension Initiative project 2015-2018 (Award #2015-51300-24192) for funding to complete this project.

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Correspondence to Julie M. Grossman.

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The authors have no relevant financial or non-financial interests to disclose. All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Charlotte Thurston. The first draft of the manuscript was written Charlotte Thurston, with a significantly revised draft written by Rebecca Fudge and Julie Grossman. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Responsible Editor: Euan K. James.

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Thurston, C.L., Grossman, J.M., Fudge, R. et al. Cold stress reduces nodulation and symbiotic nitrogen fixation in winter annual legume cover crops. Plant Soil 481, 661–676 (2022). https://doi.org/10.1007/s11104-022-05667-z

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  • DOI: https://doi.org/10.1007/s11104-022-05667-z

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