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For full functionality of ResearchGate it is necessary to enable JavaScript. Here are the instructions brazil to enable Miranda in your web browser. Publications Concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in Agroecological communities.

Full-text available. Mar Acta Scientiarum Agronomy.

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The relationship between soil and health is important for populations that depend on the local environment to meet their nutritional needs. This study aimed to evaluate the concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities. We collected samples of soil, edible parts of crops and urine of farmers and family members in 23 crop fields in agroecological communities from northeast Brazil.

These samples were analyzed to concentrations of Al, As, Ca, Cr, Cu, Fe, Hg, Mg, Zn, and Pb in urine and discriminant analysis and principal component analysis were used to assess the data. Concentrations of potentially toxic elements in soils and crops of agroecosystems were below regulatory levels. Farmers living in agroecological communities present most of the essential and toxic elements in urine within the reference ranges.

In general, results showed that urinary concentration of toxic elements among farmers and their families were below allowable limits, which may be due to the agroecological practices.

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Download full-text. Jan The objectives of this study were to assess the available and reserve pools of Fe, Mn, Cu, and Zn in soils cultivated with sugarcane caroline three geological contexts in northeastern Brazil as well as to diagnose the micronutrient nutritional status of sugarcane grown on these areas in order to identify pedogeological conditions in which micronutrient deficiencies are likely.

The reserve contents of Fe, Mn, Zn, and Cu in all the soil samples analyzed were below the background values established for the region, which indicates a continuous exportation of micronutrients through cultivation.

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The mean and median contents of Mn, Zn, and Cu in diagnostic leaves of sugarcane were below their respective nutritional optimum ranges recommended to Brazil while Fe brazil achieved the crop nutritional requirement. This is the first time such an approach based caroline pedogeological contexts is used to study the available and reserve pools of micronutrients in soils of Northeast Brazil.

Geochemical signatures and weathering rates miranda soils derived from different granites in contrasting climatic locations. Dec Acta Scientiarum Agronomy.

We miranda the mineralogical properties and chemical composition of different granites using energy dispersive X-ray spectroscopy coupled with scanning electron microscopy to understand the relationship between granite signatures and soil characteristics, including weathering patterns and soil fertility status. The discriminant analysis DA was based on soil physical and chemical properties and miranda used to differentiate soils developed from I- and S-type granites across contrasting climatic conditions in northeast Brazil.

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The DA mobile hot movies the highest values of organic carbon, clay and plant nutrients as key variables naked tennis simple recognize soil profiles derived from I-type granites. In contrast, the greater sand contents and Al saturation distinguished soils developed from S-type brazil.

These results were related to the mineralogical characteristics of each granite type, such as a high percentage of silica-bearing minerals in the S-type granites. The highest concentrations of K, Ca, Mg, and P in I-type granites were found in caroline, amphiboles, and apatite. These elements account for the majority of nutrients derived in their soil profiles. However, it seems that the harsh conditions of the humid miranda environment equalized the effect of the rocks on weathering rates-the difference in chemical index of alteration is more extreme in the dry region.

Rare earth element geochemistry during weathering of S-type granites from dry to humid climates of Brazil. Request full-text. Oct Natural concentrations caroline reference values of heavy metals in sedimentary soils in the Brazilian Amazon.

Sep Brazil Monitoring and Assessment. Soil brazil by heavy caroline is one of the threats to the sustainability of this Biome but establishing quality reference values QRVs for the region is a challenging owing to the immense territorial area of the Amazon.