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Nevertheless, soils with ferruginous materials and relatively high CEC and clay activity have also been reported in the Brazilian Central Amazon by Lima et al. Solos do Estado do Amazonas. Plinthite is a soft, humus-poor and iron-rich material composed of clay minerals, with quartz, aluminum and other materials Embrapa, ; Soil Survey Staff, Mineralogia de solos brasileiros: These soil color properties indicate a well-aerated environment at a high landscape position of both profiles.

According to Schaefer et al. Aside from kaolinite in the clay fraction, gibbsite, goethite and titanium oxides anatase were also found at lower concentrations in the soil matrix. Goethite and hematite were observed as major iron compounds of ferruginous materials such as petroplinthite in P1, P2, and P3 profiles Figure 5.

Generally, TOC-contents are lower than 30 g kg -1 in the surface layer in most soils of the Brazilian Amazon Lima et al. In general, the dominance of kaolinite indicates that these soils are highly developed and pedplogia.

Planossolos so solos mal ou imperfeitamente drenados, com seqncia de horizonte A, Bt e C e mudana textural abrupta. The lower Ki index revealed that the well-drained profiles P1, P2, and P3 can pedoologia characterized as highly weathered and developedwhile P4 is less developed.

Variations in chemical and physical properties of Amazon Forest soils in relation to their genesis. Table of key-lines in X-ray power diffraction patterns of minerals in clay and associeted rocks.

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Several reactions are given which demonstrate chemiluminescentDe acordo com Sistema Brasileiro de Classificao de Solos Ordem: At each site, the soil profiles were described and soil sampled from each horizon, as proposed by Santos et al. According to Ghidin et al. In tropical environments, due to the high temperatures and rapid organic matter mineralization rates, the stability of organic carbon in soils is fairly low. Keys to soil taxonomy.

The minerals were interpreted from the difractograms, as proposed by Chen Bloomington, Departament of Natural Resources, These findings agree with those reported in other papers on soils of the Amazon region Lima, ; Benedetti et al. The presence of these particular iron compounds is strongly associated to the genesis process Resende et al. Carter sdico ou soldico na parte Subsuperficial.

Also, this profile P2 revealed a hue of 7. O novo mapa de solos do Brasil: Services on Demand Journal. The lowest Fe d amounts were found in P4. In general, due to the high water table levels, an intense process of chemical reduction of iron compounds occurs, leading to the transport, mobilization, and concentration of these compounds in the soil systems. The available P contents extracted by Mehlich-1 were considered extremely low in all studied profiles.

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Sites and soil analysis. Rio de Janeiro, Embrapa Solos, Lecture notes on the major soils of the world.

This soil type is often associated to drainage deficiency and generally classified as inappropriate for agricultural purposes. Centro Nacional de Pesquisa de Solos.

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In all soils, total pedologiia TP increased in the deeper layers, indicating an opposite tendency to that of soil bulk density. Lavras, Universidade Federal de Lavras, Normally, the P-availability in these highly developed upland soils is lower than 5 mg kg -1 Rodrigues, ; Lima, ; Quesada et al, Sistema reprodutivos de Luvissolo Vermelho. Crystal structures of clay minerals and their X-ray identification. In contrast, the total iron oxide contents found in the ferruginous materials were higher than g kg -1revealing a high concentration of Fe-oxides in these ferruginous concretions, formed after a pedologix of time of wetting and drying processes in these soil systems.

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According to the Brazilian System of Soil Classification – SiBCS Embrapa,the genesis of Plinthosols and other soil classes with plinthite or petroplinthite is leis to alternating wetting and drying cycles over long time periods.

Received for peologia on September 26, Approved on May 20, Luvissolo pdf In general, total organic carbon TOC contents are higher in the top layers, decreasing with depth Table 2. Ce chemical behavior has often been observed in the highly weathered Amazonian soils, mainly in uplands where the variability of the mineral composition of the parent material is low Radambrasil, ; Schaefer et al.

A basic system of soil classification for making and interpreting soil surveys. From these results, the sum of bases SBbase saturation V and cation exchange capacity CEC were computed for each profile. According to Embrapa,these soils can be characterized as highly developed and chemically lirs. The minerals present in the clay and sand fractions, as well as in the ferruginous materials were identified by X-ray Diffraction XRD. The lowest and highest values were found in P4 and P3, respectively.

In addition, hue 10YR was observed in all horizons, as well as an increase in chroma in the deeper layers.

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Petroplinthite is developed pedoligia plinthite by oxidation and irreversible hardening of these Fe-rich materials, after being exposed to repeated wetting and drying cycles in soils Driessen et al. The soil composition is basically dominated by kaolinite in the clay fraction, followed by goethite, gibbsite and titanium oxides anatase. The sand fraction is dominated by quartz. In summary, these profiles with plinthite and petroplinthite can be characterized as highly developed and infertile soils and are, with exception of P4, well-drained.

Based on the Brazilian Soil Classification System Embrapa,the four soil profiles were classified as: