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Biological N2-fixation in grass-clover ley in response to N application in cattle slurry vs. mineral fertilizer

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Abstract

Background

The nitrogen (N) response in grass-clover is influenced by quantity and timing of N-fertilizer, but less is known about the effect of fertilizer type (animal manure vs. mineral N) and N form (ammonium vs. nitrate).

Method

A field trial was established in a mixture of white clover (Trifolium repens L.), red clover (Trifolium pratense L.) and perennial ryegrass (Lolium. perenne L.) with mineral N and slurry. DM yield in grass and clover and N2-fixation activity (%Ndfa) was determined in four cuts during the season.

Results

Fertilization resulted in a peak in soil mineral N within 1-2 weeks of application and decreased to background rate prior to plant harvest. No differences in white clover N2-fixation activity were found between fertilizer types within each N level.

Conclusions

The experiment showed that mineral N form does not affect the regulation of N2-fixation activity. The fertilizer N level was the only factor affecting white clover N2-fixation activity. Further, the results demonstrated an N threshold below which annual %Ndfa was always high (~90%). This was controlled by the companion grass’ ability to deplete the soil mineral N pool. When N fertilization exceeded this threshold (above 180 kg N ha-1 yr-1 in our case) annual %Ndfa significantly decreased as did qBNF in the harvested biomass.

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Acknowledgements

We gratefully acknowledge the help of the staff at Foulumgaard and lab technicians Cecilie Kokholm, Kathrine Øster Høstgaard, Margit Paulsen and Jørgen Munksgaard Nielsen.

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Funding

The study was funded by Innovation Fund Denmark through the SmartGrass project.

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Correspondence to J. Eriksen.

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Responsible Editor: Euan K. James.

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Kristensen, R.K., Rasmussen, J. & Eriksen, J. Biological N2-fixation in grass-clover ley in response to N application in cattle slurry vs. mineral fertilizer. Plant Soil 471, 629–641 (2022). https://doi.org/10.1007/s11104-021-05256-6

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  • DOI: https://doi.org/10.1007/s11104-021-05256-6

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