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Mineralogia de solos brasileiros: The land suitability of Plinthosols is strongly related with the deepness, thickness and drainage of the plinthic horizon.

Goethite and hematite were observed as major iron compounds of ferruginous materials such as petroplinthite in P1, P2, and P3 profiles Figure 5.

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The results showed that all soils were extremely unfertile, with pH levels ranging between strong and moderate acidity, very low sum of bases and organic matter content, and of available P.

London, Mineralogical Society, Variations in chemical and physical properties of Amazon Forest soils in relation to their genesis. The lowest values were observed for P4, especially in the B 1 and B 2 horizons, suggesting low water drainage capacity of this soil. In the clay and sand fractions, kaolinite and quartz were predominant, respectively Figures 2 and 3. Oxford, Oxford University Press, According to the XRD analysis, the mineralogical characteristics of these pedoloyia are quite similar.

A number df soil morphological horizon denomination and thickness, Munsell color and physical properties particle size distribution, bulk density and total porosity were also studied, using methods described by Santos et al.

Keys to soil taxonomy. From these results, the sum of bases SBbase saturation V and cation exchange capacity CEC were computed for each profile. Physical and chemical limitations such as low water infiltration rates and natural fertility are often ascribed to these systems. Geological survey occasional paper, The lowest and highest values were found in P4 and P3, respectively.


Rio de Janeiro, 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. So solos minerais com argila de atividade alta. Apresentam horizonte B textural imediatamente 19 Pedologis de Pedologia.

Dw, soils with ferruginous materials and relatively high CEC and clay activity have also been reported in the Brazilian Central Amazon by Lima et al. Pefologia for publication on September 26, Approved on May 20, pddologia Profile P4 had a higher silt content than the other profiles, which lkes between and g kg -1 Table 1revealing a lower development stage than the other profiles.

Aside from kaolinite in the clay fraction, gibbsite, goethite and titanium oxides anatase were also found at lower concentrations in the soil matrix. Viscosity of a solution of Luviskol Plus in waterethanol and water isopropanol Because the polymer solution has such a low viscosity, ne spray droplets pedklogia be obtained even with a high solids content and or a high water content.

In our study area in the Central Amazon, the occurrence of such soils is quite frequent; however, there is still little research on their chemical and mineralogical properties. Levantamentos de recursos Naturais, Based on the Brazilian Soil Classification System Embrapa,the four soil profiles were classified as: Waterlogging and reduced water storage capacity limit the agricultural management of Plinthosols.

Museu Paranaense Emilio Goeldi, Ser. The clay material was separated by sedimentation pipette method. Morphological and physical properties.

Plinthosols are composed of mineral material with either a plinthic or a petroplinthic horizon 50 cm below the soil surface, or a plinthic horizon cm deep, when underlying either an albic horizon or a horizon with stagnic properties Embrapa, ; IUSS Working Group WRB, The profile classification and soil morphological and physical properties are given in table 1. Geodiversidade do Estado do Amazonas.


In all soils, total porosity TP increased in the deeper layers, indicating an opposite tendency to that of soil bulk density. The available Fe contents extracted by Mehlich-1 were considered extremely low in ce studied profiles.

The weathering stage of these soils was assessed by means of Ki and Kr indexes, and the amounts of free and amorphous Fe se Al oxides by using dithionite citrate bicarbonate DBC and ammonium oxalate dissolution procedures, respectively.

Interactions of soil mineral switch natural organics les microbes. The cationic nutrient contents were rather low in all soil profiles Table 2i.

This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM Central Amazon. According to Schaefer et al.

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X-ray diffraction and the identification and analysis of clay minerals. Also, other important bioclimatic factors pdeologia as high amounts of precipitation and temperatures increased leaching and nutrient depletion from the rooting zone to deeper pedoologia, contributing to this low chemical soil quality in the region. 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.

Chemical properties and mineralogy of soils with plinthite and psdologia in Iranduba AMBrazil 1. Carter sdico ou soldico na parte Subsuperficial. Sistema reprodutivos de Luvissolo Vermelho. Ntida diferena entre horizontes A e BT. Pedregosidade na parte superficial. World reference base for soil resources.

The lowest values were found for profile P1, and the highest for profile P3. Luvissolo pdf