Determinação da cor do solo a partir de dados radiométricos e sua relação com teores de hematita.

Color is widely recognized as a primary identifying parameter of soil. The physical, mineralogical, and chemical properties can be derived from assessing the subsurface color characteristics. The present research aimed to estimating the hematite content clay fraction, in laboratory, from data related to soil color obtained by using automatic devices. Fifteen subsurface soil samples from São Paulo State had their clay fraction hematite contents semiquantitavely determined by the association of chemical and physical methods and their colors evaluated in laboratory through measurements made with a spectro-radiometer. The radiometric data were used to the determination of soil color in L*a*b* and Munsell systems and to the calculation of reddish indexes (RI). The RI values show functional dependence of hematite contents and the best relation is verified with RI values derived from color determined in the L*a*b* system. Exponential models, developed from remote sensors, show themselves adequate in predicting the soil hematite contents.

Bibliographic Details

Main Authors:	CAMPOS, R. C., DEMATTÊ, J. A. M., QUARTAROLI, C. F., FORMAGGIO, A. R., TISOT, D. A.
Other Authors:	ROGÉRIO COSTA CAMPOS, INPE; JOSÉ ALEXANDRE MELO DEMATTÊ, USP-ESALQ; CARLOS FERNANDO QUARTAROLI, CNPM; ANTONIO ROBERTO FORMAGGIO, INPE; DANIELA ARNOLD TISOT, USP-ESALQ.
Format:	Anais e Proceedings de eventos biblioteca
Language:	English eng
Published:	2015-01-07
Subjects:	Dados radiométricos., Oxido de Ferro.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1004608
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