The soil characteristics of most Brazilian soils offer nutritional limitations to full plant growth. Applications of lime and fertilizer correct chemical limitations of the soil, but may contain potentially toxic elements (EPT) that can accumulate in the soil. Vegetable crop Areas which receive high doses of lime and fertilizer are highly susceptible to EPTs accumulation in the soil which can be transferred to food, animals and man. The objective is to evaluate the speciation and the kinetics of sorption and desorption of two EPTs in the soil and the potential risk of contamination to food yield in areas with high applications of inputs. Soil samples with contrasting mineralogical attributes will be collected as well as growing plant material in four vegetable crops production locations: Piedade/SP, Mogi das Cruzes/SP, São Gotardo/MG and Guarapuava/PR, areas that have a long history of fertilization . The soil will also be sampled in adjacent areas of native forest, which will serve as a reference for "not having received fertilization". The spatial distribution and speciation of EPTs in soil samples will be carried out by means of infrared spectroscopy, X-ray fluorescence spectroscopy and x-ray absorption through Synchrotron Light. The results will be integrated through analysis of main components and multiple linear regression for the soil properties and the most expressive-response variables to explain the behavior of EPTs in soil and their accumulation in plant tissues.
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