Guinet, Maé
- Institutionen för biosystem och teknologi, Sveriges lantbruksuniversitet
Sammanfattning
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.
Nyckelord
Grain legumes; Plant growth; Nitrogen nutrition; Symbiotic N-2 fixation; Nitrogen use efficiency; Root soil exploration
Publicerad i
Plant and Soil
2018, volym: 432, nummer: 1-2, sidor: 207-227
Utgivare: SPRINGER
SLU författare
UKÄ forskningsämne
Jordbruksvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1007/s11104-018-3788-1
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/96989