The present project aims to: a) assess the potential of using indirect techniques (diffuse reflectance spectroscopy and magnetic susceptibility) in the prediction of iron oxides hematite and goethite, physical and chemical properties of soil in different of landscape compartments, b) the mapping of specific areas of management in commercial areas of cane sugar from pedotransfer functions using iron oxides, c) use the diffuse reflectance spectroscopy in the study of quantification and spatial variability of carbon and soil CO2 emission in areas of cane sugar tillage system. Will be sampled an area of approximately 1000 hectares located in the northeast of the state of São Paulo, in the municipality of Guatapará. In area will be enclosed a transect and a sampling grid. To study the soil carbon and soil CO2 emission will used an area of 90 ha cultivated with sugar cane handled with straw. Physical, chemical and mineralogical analysis will be conducted. Indirect methods to be used are: diffuse reflectance spectroscopy and magnetic susceptibility. All attributes will be submitted to the statistical and geostatistical analyzes to assess dependence and spatial variability. The geostatistical analysis will be performed by calculating the semivariance as a function of separation distance (experimental semivariogram). The estimated values of properties in locations not sampled will be performed by means of ordinary kriging. The multivariate structure of the original set of data will be evaluated by principal component analysis. Pedotransfer functions will be calibrated and validated for prediction of soil attributes using mostly iron oxides as predictors. Maps will be constructed of soil attributes using the values predicted areas and validated for accuracy.
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