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| Silva,Alexandre Christófaro; Souza,Solange de; Fabris,José Domingos; Barbosa,Maurício Soares; Barral,Uidemar Morais; Costa,Roberto Vial. |
| ABSTRACT In the Southern Espinhaço Mountain Chain and in the Upper Jequitinhonha Valley, magnetic soils, in different pedogenetic stages, are found to be forming over intrusions of basic lithology. The essential chemical and mineralogical properties of samples from magnetic soil profiles from those two physiographic environments in the state of Minas Gerais, Brazil, are reported. Three of the pedons (Rhodic Kandiustox – RKox, Rhodic Haplustox – RHox, and Typic Argiustoll - TAoll) were identified as being indeed developed over basic rocks; the fourth pedon (Typic Haplustox - THox) is currently forming on an acidic rock. Particle size and routine chemical analyses were performed on samples from all horizons of the four selected soil profiles. For a deeper... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Iron oxides; X ray diffractometry; Mössbauer spectroscopy; Scanning electron microscopy; Energy dispersive spectroscopy. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100305 |
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| Silveira,Vivian C. da; Oliveira,Anna P. de; Sperotto,Raul A.; Espindola,Luciana S.; Amaral,Lívio; Dias,Johnny F.; Cunha,João B. da; Fett,Janette P.. |
| Iron is an essential nutrient for plants. In aerobic conditions, Fe is highly unavailable for plant uptake, and Fe deficiency can be severe in plants grown in calcareous soils. In waterlogged soils, however, Fe availability increases and can reach toxic concentrations. Rice is an important staple crop worldwide and faces iron deficiency or excess, depending on the growth conditions. To contribute to the study of mechanisms involved in response to Fe deficiency and resistance to Fe excess, experiments were carried out with rice cultivars BR-IRGA 409 (I409, susceptible to Fe toxicity) and EPAGRI 108 (E108, resistant to Fe toxicity) grown in culture solutions and submitted to Fe excess, control concentration or deficiency (500, 6.5 or zero mg L-1 Fe,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferritin; Iron deficiency; Iron toxicity; Mössbauer spectroscopy; Oryza sativa; PIXE. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200005 |
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