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- W2611187870 abstract "SUMMARY The Brazilian System of Soil Classification (SiBCS) is a taxonomic system,open and in permanent construction, as new knowledge on Brazilian soils isobtained. The objective of this study was to characterize the chemical, physical,morphological, micro-morphological and mineralogical properties of four pedonsof Oxisols in a highland toposequence in the upper Jequitinhonha Valley,emphasizing aspects of their genesis, classification and landscape development.The pedons occupy the following slope positions: summit - Red Oxisol (LV), midslope (upper third) – Yellow-Red Oxisol (LVA), lower slope (middle third)– YellowOxisol (LA) and bottom of the valley (lowest third) - “Gray Oxisol” (LAC). Thesepedons were described and sampled for characterization in chemical and physicalroutine analyses. The total Fe, Al and Mn contents were determined by sulfuricattack and the Fe, Al and Mn oxides in dithionite-citrate-bicarbonate and oxalateextraction. The mineralogy of silicate clays was identified by X ray diffraction andthe Fe oxides were detected by differential X ray diffraction. Total Ti, Ga and Zrcontents were determined by X ray fluorescence spectrometry. The LAC is gray-colored and contains significant fragments of structure units in the form of a densepaste, characteristic of a gleysoil, in the horizons A and BA. All pedons are veryclayey, dystrophic and have low contents of available P and a pH of around 5. Thesoil color was related to the Fe oxide content, which decreased along the slope.The decrease of crystalline and low- crystalline Fe along the slope confirmed the" @default.
- W2611187870 created "2017-05-12" @default.
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- W2611187870 date "2010-01-01" @default.
- W2611187870 modified "2023-09-27" @default.
- W2611187870 title "SEÇÃO V - GÊNESE, MORFOLOGIA E CLASSIFICAÇÃO DO SOLO" @default.
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