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Color Attributes and Mineralogical Characteristics, Evaluated by Radiometry, of Highly Weathered Tropical Soils

^a Dep. de Solos, Univ. Federal de Viçosa, 36570-000, Viçosa, MG, Brazil
^b Faculdade Politécnica de Uberlândia, 38400-436, Uberlândia, MG, Brazil

View larger version (14K): [in a new window]   Fig. 1. Brazilian map showing Minas Gerais State and the location of the profiles sampled.

View larger version (18K): [in a new window]   Fig. 2. Munsell values of A and B horizons of some goethitic and hematitic soil samples.

View larger version (14K): [in a new window]   Fig. 3. Regression equations for the relationship between hematite content and (a) the redness rating (RR) and (b) the redness factor (RF).

View larger version (14K): [in a new window]   Fig. 4. Regression equations for the relationship between hematite content and (a) redness rating (RR) and (b) redness factor (RF), excluding Rhodic Acrudox 2.

View larger version (11K): [in a new window]   Fig. 5. Regression equations for the relationship between hematite/goethite ratio and (a) the redness rating (RR) and (b) the redness factor (RF), excluding Rhodic Acrudox 2.

View larger version (19K): [in a new window]   Fig. 6. Spectroradiometric curves of the B horizons of the Typic Hapludox 3 (TH3B), Plinthaquox (PTB), and Xantic Hapludox (XHB). BRF = bidirectional reflectance factor.

View larger version (17K): [in a new window]   Fig. 7. Spectroradiometric curves of the B horizons of the Typic Hapludox 1 and 2 (TH1B and TH2B), and Humic Hapludox (HHB). BRF = bidirectional reflectance factor.

View larger version (18K): [in a new window]   Fig. 8. Spectroradiometric curves of the B horizons of the Rhodic Hapludox 1 and 2 (RH1B and RH2B), Rhodic Eutrudox 1 (RE1B). BRF = bidirectional reflectance factor.

View larger version (18K): [in a new window]   Fig. 9. Spectroradiometric curves of the B horizons of the Rhodic Acrudox 1 and 2 (RA1B and RA2B) and Rhodic Eutrudox 2 (RH3B). BRF = bidirectional reflectance factor.

View larger version (16K): [in a new window]   Fig. 10. Spectroradiometric curves of the A and B horizons of the Typic Hapludox 3 (TH3A and TH3B). BRF = bidirectional reflectance factor.

View larger version (18K): [in a new window]   Fig. 11. Spectroradiometric curves of the A, AB, and B horizons of the Humic Hapludox (HHA, HHA/B, and HHB). BRF = bidirectional reflectance factor.

View larger version (16K): [in a new window]   Fig. 12. Spectroradiometric curves of A and B horizons of the Typic Hapludox 2 (TH2A and TH2B). BRF = bidirectional reflectance factor.

View larger version (16K): [in a new window]   Fig. 13. Spectroradiometric curves of the A and B horizons of the Rhodic Hapludox 2 (RH2A and RH2B). BRF = bidirectional reflectance factor.

View larger version (16K): [in a new window]   Fig. 14. Spectroradiometric curves of the A and B horizons of the Rhodic Acrudox 1 (RA1A and RA1B). BRF = bidirectional reflectance factor.

View larger version (16K): [in a new window]   Fig. 15. Spectroradiometric curves of the A and B horizons of the Rhodic Acrudox 2 (RA1A and RA2B). BRF = bidirectional reflectance factor.