Nitrogen fixation of lablab and finger millet in South-India

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dc.date.accessioned2024-04-08T13:43:32Z
dc.date.available2024-04-08T13:43:32Z
dc.date.issued2023-12-21
dc.description.sponsorshipGefördert im Rahmen des Projekts DEALger
dc.description.sponsorshipGerman Research Foundationeng
dc.identifierdoi:10.17170/kobra-202404049896
dc.identifier.urihttp://hdl.handle.net/123456789/15634
dc.language.isoeng
dc.relation.doidoi:10.1002/jpln.202300319
dc.relation.projectidGrant Number: 279374797
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subject¹⁵Neng
dc.subjectdystric nitisoleng
dc.subjectEleusine indicaeng
dc.subjectisotopic labelingeng
dc.subjectLablab purpureuseng
dc.subjectsymbiotic and associative N₂-fixationeng
dc.subject.ddc580
dc.subject.swdIndien (Süd)ger
dc.subject.swdStickstofffixierungger
dc.subject.swdFingergrasger
dc.subject.swdHelmbohneger
dc.titleNitrogen fixation of lablab and finger millet in South-Indiaeng
dc.typeAufsatz
dc.type.versionpublishedVersion
dcterms.abstractBackground In a long-term rotation experiment (2016–2022) with different nitrogen (N) fertilizer levels in subtropical South-India, crop yields of low N plots were unexpectedly high. We therefore hypothesized that in the absence of mineral N application, these yields are largely due to N inputs by N₂ fixation in the component crops. To assess the diazotrophic N₂-fixation of lablab (Lablab purpureus L. Sweet) and possible associative N₂-fixation of finger millet (Eleusine coracana L. Gaertn), a controlled experiment was conducted during the 2021 monsoon season within the above-mentioned long-term field study. Two approaches were used to estimate the quantity of N derived from the atmosphere (Ndfa): the dilution method using a 15N-labeled fertilizer and the natural abundance method. Method For the ¹⁵N dilution method irrigated maize (Zea maize L.), finger millet and lablab were labeled with two split applications of 10% 1¹⁵N fertilizer (50:50 ¹⁵N-urea and ¹⁵N-ammonium sulfate) amounting to a total of 15 kg N ha−1. Maize was selected as the non-fixing reference plant to estimate diazotrophic N₂-fixation. The entire aboveground biomass of the labeled plants was harvested at maturity and analyzed for total DM, N concentration, and the ¹⁵N isotope ratio. Results N₂ fixation efficiency for lablab was 52%–69% depending on the calculation method, corresponding to 40–53 kg N ha−1. For finger millet, the natural abundance method resulted in an estimated N2-fixation of 5 kg N ha−1, which was suggested by the results of the dilution method whereby the reference plant maize was only poorly labeled. Conclusion Labeling of maize might have been diluted due to unexpected associative N₂-fixation or N-uptake from unlabeled deep soil N pools. The data underline the importance of symbiotic N₂-fixation in crop rotation systems of South-India.eng
dcterms.accessRightsopen access
dcterms.creatorMock, Andrea
dcterms.creatorIngold, Mariko
dcterms.creatorVazhacharickal, Prem Jose
dcterms.creatorSourav, Suman Kumar
dcterms.creatorDittert, Klaus
dcterms.creatorBürkert, Andreas
dcterms.source.identifiereissn:1522-2624
dcterms.source.issueIssue 2
dcterms.source.journalJournal of Plant Nutrition and Soil Scienceeng
dcterms.source.pageinfo225-232
dcterms.source.volumeVolume 187
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