Journal
PLANT AND SOIL
Volume 432, Issue 1-2, Pages 207-227Publisher
SPRINGER
DOI: 10.1007/s11104-018-3788-1
Keywords
Grain legumes; Plant growth; Nitrogen nutrition; Symbiotic N-2 fixation; Nitrogen use efficiency; Root soil exploration
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Funding
- INRA
- Ministry in charge of Agriculture
- ANR LEGITIMES
- INRA Bourgogne-Franche-Comte Region (PSDR project ProSys)
- European Community [FP7-613551]
- Terres Inovia
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AimsA 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, N-2 fixation, while limiting environmental risks such as N leaching.MethodsA comparative analysis was performed for ten legume crops, grown in a field experiment and supplied with four N fertiliser rates. Dry matter, N concentration and SNF were measured. In parallel, root elongation rates were studied in a greenhouse experiment.ResultsFor most species, N fertilisation had little effect on plant growth and N accumulation. SNF was reduced by soil inorganic N available at sowing but with large differences in the magnitude of the response among species. The response varied according to plant N requirements for growth and plant ability to retrieve inorganic N. Accordingly, root lateral expansion rate measured in RhizoTubes was highly correlated with plant ability to retrieve inorganic N measured in the field experiment.ConclusionCombining SNF response to soil inorganic N, shoot N and plant ability to retrieve inorganic N, allowed a robust evaluation of differential response to soil inorganic N among a wide range of legume species.
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