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Quantification of nitrogen fluxes and explanatory plant traits during a two year legume-cereal rotation

Abstract : A better understanding of how plant growth, N nutrition and symbiotic nitrogen fixation (SNF) are influenced by soil inorganic N availability, for a wide range of legume species, is crucial to optimise legume productivity, N2 fixation, while limiting environmental risks such as N leaching. A comparative analysis was performed for ten legume crops, grown in a field experiment and supplied with four levels of N fertiliser. Dry matter, N concentration and SNF were measured. Parallely, root traits were studied in a greenhouse experiment. For most species, inorganic N inputs had little effect on plant growth and N nutrition. SNF was negatively affected by soil inorganic N available at sowing but with large differences among species. The response varied according to plant N requirements for growth and plant inorganic N uptake ability. Legumes root systems differed according to root exploration of the soil, root branching and their response to inorganic N inputs; these observations were in great accordance with observations of plant ability to uptake inorganic N measured in the field experiment. Combining SNF response to soil inorganic N, shoot N and plant ability to uptake inorganic N, allowed a robust evaluation of species differential response to soil inorganic N.
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https://hal.inrae.fr/hal-02786559
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Submitted on : Friday, June 5, 2020 - 12:21:20 AM
Last modification on : Wednesday, April 7, 2021 - 3:34:28 AM

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  • HAL Id : hal-02786559, version 1
  • PRODINRA : 463554

Citation

Maé Guinet, Bernard Nicolardot, Cécile Revellin, Vincent Durey, Georg Carlsson, et al.. Quantification of nitrogen fluxes and explanatory plant traits during a two year legume-cereal rotation. 7ème Journée des Doctorants de l’UMR 1347 Agroécologie, May 2018, Dijon, France. ⟨hal-02786559⟩

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