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- Title
Impact of rhizobial inoculation and reduced N supply on biomass production and biological N<sub>2</sub> fixation in common bean grown hydroponically.
- Authors
Kontopoulou, Charis‐Konstantina; Liasis, Epifanios; Iannetta, Pietro PM; Tampakaki, Anastasia; Savvas, Dimitrios
- Abstract
BACKGROUND Testing rhizobial inoculation of common bean ( Phaseolus vulgaris L.) in hydroponics enables accurate quantification of biological N2 fixation ( BNF) and provides information about the potential of reducing inorganic N fertilizer use. In view of this background, common bean grown on pumice was inoculated with Rhizobium tropici CIAT899 ( Rt) and supplied with either full-N (total nitrogen 11.2 mmol L−1), 1/3 of full-N or N-free nutrient solution ( NS). BNF was quantified at the early pod-filling stage using the 15N natural abundance method. RESULTS Full-N supply to Rt-inoculated plants resulted in markedly smaller nodules than less- or zero-N supply, and no BNF. Rt inoculation of full-N-treated plants did not increase biomass and pod yield compared with non-inoculation. Restriction (1/3 of full-N) or omission of inorganic N resulted in successful nodulation and BNF (54.3 and 49.2 kg N ha−1, corresponding to 58 and 100% of total plant N content respectively) but suppressed dry shoot biomass from 191.7 (full-N, + Rt) to 107.4 and 43.2 g per plant respectively. Nutrient cation uptake was reduced when inorganic N supply was less or omitted. CONCLUSION Rt inoculation of hydroponic bean provides no advantage when full-N NS is supplied, while 1/3 of full-N or N-free NS suppresses plant biomass and yield, partly because the restricted NO3− supply impairs cation uptake. © 2017 Society of Chemical Industry
- Subjects
RHIZOBIUM; HYDROPONICS; NITROGEN in animal nutrition; COMMON bean; NITROGEN fixation
- Publication
Journal of the Science of Food & Agriculture, 2017, Vol 97, Issue 13, p4353
- ISSN
0022-5142
- Publication type
Article
- DOI
10.1002/jsfa.8202