Biological nitrification inhibition by rice root exudates in two different soils of Uruguay

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dc.creatorIllarze, Gabriela
dc.creatorArango, Jacobo
dc.creatorNuñez, Jonathan
dc.creatorIrisarri, Pilar
dc.date2021-08-31
dc.date2021-11-11T15:04:15Z
dc.date2021-11-11T15:04:15Z
dc.date.accessioned2026-06-27T13:22:18Z
dc.descriptionRice root exudates can control nitrification by releasing biological nitrification inhibitors (BNIs), reducing nitrogen losses in agricultural soils. However, the inhibitory effect on nitrification and the abundance of ammonia oxidisers in different soil types remain unclear. Two temperate paddy soils with different organic matter contents were collected to investigate the impact on nitrification rates of two rice cultivar root exudates, El Paso 144 (O. sativa ssp. indica) and Tacuarí (O. sativa spp. japonica). Root exudates were extracted before the tillering growth stage, and their BNI potential was evaluated in a bioassay with luminescent Nitrosomonas europaea and in a 12-day soil microcosm incubation. While exudates from Tacuarí showed stronger BNI activity in the bioassay, its nitrification inhibition in both soils was similar to that of DCD. El Paso did not show BNI activity in Salto whose organic matter content was higher. The abundance of ammonia oxidisers was not affected by root exudates or DCD, but only ammonia-oxidising bacteria had a significant positive relationship with soil nitrate. Our results demonstrated that although the bioassay showed high BNI activity, its expression in soils varied depending on the rice cultivar and the type of soil, particularly with its organic matter content.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/116005
dc.identifier.urihttp://hdl.handle.net/123456789/57281
dc.languageen
dc.publisherInforma UK Limited
dc.rightsOpen Access
dc.sourceIllarze, G.; Arango, J.; Nuñez, J.; Irisarri, P. (2021) Biological nitrification inhibition by rice root exudates in two different soils of Uruguay. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, Online first paper (16 Jul 2021). ISSN: 0906-4710
dc.subjectnitrification inhibitors
dc.subjectammonia
dc.subjectoxidants
dc.subjectsoil analysis
dc.subjectroot exudates
dc.subjectinhibidores de la nitrificación
dc.subjectamoníaco
dc.subjectoxidantes
dc.subjectanálisis del suelo
dc.subjectexudados radiculares
dc.titleBiological nitrification inhibition by rice root exudates in two different soils of Uruguay
dc.typeJournal Article

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