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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mapping of clay, iron oxide and adsorbed phosphate in Oxisols using diffuse reflectance spectroscopy

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Camargo, Livia Arantes [1] ; Marques Junior, Jose [1] ; Barron, Vidal [2] ; Ferracciu Alleoni, Luis Reynaldo [3] ; Barbosa, Ronny Sobreira [4] ; Pereira, Gener Tadeu [1]
Total Authors: 6
[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, BR-14884900 Jaboticabal, SP - Brazil
[2] Univ Cordoba, Dept Agron, E-14071 Cordoba - Spain
[3] Univ Sao Paulo, Coll Agr Luiz de Queiroz ESALQ, BR-13418900 Piracicaba, SP - Brazil
[4] Univ Fed Piaui, BR-64900000 Bom Jesus, PI - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Geoderma; v. 251, p. 124-132, AUG 2015.
Web of Science Citations: 20

Diffuse reflectance spectroscopy (DRS) provides a rapid, non-destructive, less expensive and sustainable complement to conventional methods of soil analysis. This study aims to assess the DRS ability to predict contents of clay, iron oxide and adsorbed phosphate (Pads), characterizing their spatial variability in Oxisols from Brazil. Soil samples collected from three geomorphic surfaces were scanned in the visible and near infrared spectral range. Moreover, chemometric calibration was obtained through partial least-squares regression (PLSR). Then, spatial distribution maps of the attributes were constructed using predicted values from calibrated models through geostatistical methods. The best accuracy of prediction models (residual prediction deviation >2.0) for clay, extractable Fe by dithionite-citrate-bicarbonate and hematite was obtained within the visible region (380-800 nm), and for adsorbed phosphate within the visible near infrared (380-2300 nm). Predicted values of these attributes had low error (<10%) with the exception of goethite, and enabled building maps similar to those with measured values, demonstrating the DRS importance for clay, iron oxide and adsorbed phosphate mapping of large areas and at detailed scale. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/25118-4 - Mapping of specific areas of management using indirect techniques in oxisols under cultivation of cane sugar
Grantee:José Marques Júnior
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants