Caracterização Espectral dos Solos da Fazenda Vale do Curu

Abstract

Soil characterization and its properties through mapping and classifications of a particular region are useful in helping to determine proper soil use and suitability. The state of Ceará does not have a very large spectral library of the soils and the research in the area of Spectroradiometry - ER does not cover the entire territory of the state. The need to fill the gap on the spectral behavior of Ceará soils on a regional scale and contribute to the advancement of this area in Brazilian soil science substantiate the development of this research. With this in mind, the present study seeks to characterize the spectral curves of soils, based on reflectance spectroscopy, and thus feed the spectral library of soils of the Brazilian semiarid region, being carried out at the Vale do Curu Experimental Farm, owned by the Federal University of Ceará (UFC). A traditional soil map was made, where 3 samples were collected at different depths, being 0-20, 40-60 and 80-100 cm. With these samples, chemical and particle size analyzes were obtained, as well as spectral data through the FieldSpec Pro FR 3 (Analytical Spectral Devices, Boulder, Colorado, USA) Spectroradiometer hyperspectral sensor. Thus, we obtained the traditional map of the region, composed by PLINTOSSOLO HÁPLICO, PLINTOSSOLO ARGILÚVICO, CAMBISSOLO FLÚVICO e ARGISSOLO VERMELHO-AMARELO. These soils obtained different spectral curves, where it was possible to characterize some properties of the soils such as mineralogy, presence of OH groups and intercalate water, organic matter and iron oxides. Thus, it is concluded that the spectral curves were useful to classify the soils influencing the delimitation of the traditional soils map of Vale do Curu Farm.