Potassium Dynamics in Ruzigrass Rhizosphere

dc.contributor.authorVolf, Marcelo Raphael [UNESP]
dc.contributor.authorGuimaraes, Tiara Moraes [UNESP]
dc.contributor.authorScudeletti, Daniele [UNESP]
dc.contributor.authorCruz, Igor Vilela [UNESP]
dc.contributor.authorRosolem, Ciro Antonio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2019-10-04T12:32:35Z
dc.date.available2019-10-04T12:32:35Z
dc.date.issued2018-01-01
dc.description.abstractRuzigrass (Urochola ruziziensis) has a large capacity to take up K from the soil, including non-exchangeable forms, and can play an important role in nutrient cycling in integrated production systems. However, K transport to roots of brachiarias is not well known, nor the nutrient dynamics in the rhizosphere, where a concentration gradient may be established towards the non-rhizospheric soil, creating a favorable environment for the release of non-exchangeable K. This study aimed to evaluate the effect of ruzigrass on K dynamics in the rhizosphere and on non-exchangeable K release. Ruzigrass was grown in pots filled with a Latossolo Vermelho Amarelo (Typic Hapludox) that was collected at 0.00-0.20 and 0.20-0.60 m layer from a cultivated area and fertilized with 0, 30, and 60 mg kg(-1) of K, plus a treatment with forest soil, used as control. Thirty days after plant emergence, soil samples were taken at the following distances from the roots: 0.5, 1.0, 1.5, 3.0, 5.0, and 10.0 mm. For the highest exchangeable K rate (60 mg dm(-3)), the exchangeable K level was higher from 0 to 0.5 mm of the roots for both soils (0.00-0.20 and 0.20-0.60 m). Therefore, more K was transported to the rhizosphere than the plant could take up. A depletion of exchangeable K observed in the rhizosphere resulted in the release of K from non-exchangeable forms, as observed in the soils from 0.00-0.20 (60 mg dm(-3)) and 0.20-0.60 m (without application of K). Ruzigrass grown on low K soils without fertilizer application results in a larger exchangeable K depletion zone than in soils that were fertilized or originally high in exchangeable K, showing a high potential for K cycling in the system.en
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Agron, Area Agr, Posgrad Agron, Botucatu, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Agron, Dept Prod & Melhoramento Vegetal, Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Agron, Area Agr, Posgrad Agron, Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Agron, Dept Prod & Melhoramento Vegetal, Botucatu, SP, Brazil
dc.format.extent12
dc.identifierhttp://dx.doi.org/10.1590/18069657rbcs20170370
dc.identifier.citationRevista Brasileira De Ciencia Do Solo. Vicosa: Soc Brasileira De Ciencia Do Solo, v. 42, 12 p., 2018.
dc.identifier.doi10.1590/18069657rbcs20170370
dc.identifier.fileS0100-06832018000100531.pdf
dc.identifier.issn0100-0683
dc.identifier.lattes5720775873259528
dc.identifier.orcid0000-0003-2001-0874
dc.identifier.scieloS0100-06832018000100531
dc.identifier.urihttp://hdl.handle.net/11449/185081
dc.identifier.wosWOS:000450845900001
dc.language.isoeng
dc.publisherSoc Brasileira De Ciencia Do Solo
dc.relation.ispartofRevista Brasileira De Ciencia Do Solo
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectUrochloa ruziziensis
dc.subjectnon-exchangeable K
dc.subjectexchangeable K
dc.subjectrhizospheric soil
dc.titlePotassium Dynamics in Ruzigrass Rhizosphereen
dc.typeArtigo
dcterms.rightsHolderSoc Brasileira De Ciencia Do Solo
unesp.author.lattes5720775873259528[5]
unesp.author.orcid0000-0003-2001-0874[5]

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