Degree of phosphate saturation in highly weathered tropical soils

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dc.contributor.authorCampos, Murilo de [UNESP]
dc.contributor.authorAntonangelo, Joao Arthur
dc.contributor.authorvan der Zee, Sjoerd E. A. T. M.
dc.contributor.authorFerracciu Alleoni, Luis Reynaldo
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionOklahoma State Univ
dc.contributor.institutionWageningen Univ
dc.contributor.institutionMonash Univ
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-26T17:54:31Z
dc.date.available2018-11-26T17:54:31Z
dc.date.issued2018-07-30
dc.description.abstractThe degree of phosphate saturation (DPS) is an indicator for P-saturation, which is of assistance to the prediction of P losses and potential eutrophication of surface water. The scaling factor (alpha) estimates the adsorption capacity of the soil and is used to calculate the DPS. In soils from temperate regions, the value of alpha = 0.5 is widely used. However, using just a single value for alpha may fail to estimate the adsorption capacity correctly for all soils. In this study, the aims were (i) to calculate the scaling factor alpha and the DPS of highly weathered tropical soils with different chemical, physical and mineralogical properties in order to predict P losses; and (ii) to identify which soil properties are related to P adsorption. The scaling factor a and the DPS were calculated at 1, 3, 7, 21, 42 and 84 days (d), the highest one in recognition of the long-term kinetics of sorption. The values of alpha increased as the contact period increased. Lower DPS values were obtained in soils with high P adsorption capacity whereas the highest DPS values were obtained in soils with a lower adsorption capacity. Out of ten Oxisols studied, six of them had an a higher than 1. Contents of clay, organic carbon (C) and poorly crystalline (Al-ox) and crystalline (free) Al oxides were the properties that best correlated with P adsorption. For the Oxisols, the clay content, poorly crystalline together with crystalline Fe and Al oxides represented the main components related to P adsorption. The highest DPS (31%) was found in Typic Udorthent. The content of poorly crystalline oxides was not suitable for the scaling factor alpha for most Oxisols, and only the Typic Udorthent exceeded the critical threshold of 23%, and is thus more susceptible to loss of P.en
dc.description.affiliationSao Paulo State Univ, Dept Crop Sci, Lageado Farm, 1780 Jose Barbosa de Barros, BR-18610307 Botucatu, SP, Brazil
dc.description.affiliationOklahoma State Univ, Plant & Soil Sci Dept, 039 Agr Hall, Stillwater, OK 74078 USA
dc.description.affiliationWageningen Univ, Dept Environm Sci Soil Phys & Land Management, NL-6708 PB Wageningen, Netherlands
dc.description.affiliationMonash Univ, Sch Chem, Melbourne, Vic, Australia
dc.description.affiliationUniv Sao Paulo, Soil Sci Dept, Luiz de Queiroz Coll Agr, 11 Padun Dias, BR-13418900 Piracicaba, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Dept Crop Sci, Lageado Farm, 1780 Jose Barbosa de Barros, BR-18610307 Botucatu, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipUniversity of Sao Paulo (USP)
dc.format.extent135-146
dc.identifierhttp://dx.doi.org/10.1016/j.agwat.2018.05.001
dc.identifier.citationAgricultural Water Management. Amsterdam: Elsevier Science Bv, v. 206, p. 135-146, 2018.
dc.identifier.doi10.1016/j.agwat.2018.05.001
dc.identifier.fileWOS000438659700015.pdf
dc.identifier.issn0378-3774
dc.identifier.urihttp://hdl.handle.net/11449/164427
dc.identifier.wosWOS:000438659700015
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAgricultural Water Management
dc.relation.ispartofsjr1,272
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectLoss of P
dc.subjectScaling factor alpha
dc.subjectDegree of P saturation
dc.subjectSorption capacity of P
dc.subjectPrincipal component analysis
dc.titleDegree of phosphate saturation in highly weathered tropical soilsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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