Resumo

CAMACHO-TAMAYO, Jesús H.; FORERO-CABRERA, Nathalia M.; RAMIREZ-LOPEZ, Leonardo  e  RUBIANO, Yolanda. Near-infrared spectroscopic assessment of soil texture in an oxisol of the eastern plains of Colombia. Colomb. for. [online]. 2017, vol.20, n.1, pp.5-18. ISSN 0120-0739.  https://doi.org/10.14483/udistrital.jour.colomb.for.2017.1.a01.

Techniques such as near infrared spectroscopy (NIR) can be used to identify classes and properties of soils with good precision. The aim of this study was to calibrate models to predict the content of clay, silt and sand of a Typic Hapludox by NIR spectroscopy. The study was carried out in the Carimagua Experimental Station located in the municipality of Puerto Gaitán, Meta, Colombia. A grid design was used, 1200 samples were collected in an area of 5100 ha. The development of the models made by partial least squares regression. A low representatively models were obtained for sand and silt contents, with values of R² (0.41 and 0.34, respectively).The model clay content showed a high R² (0.76). For the clay was possible the development of digital maps and digital spectrum maps similar. The results for the clay content indicate that laboratory analyses can be substituted, in large part, by spectral models. In the case of sand and silt, it would be convenient to improve the model so that, in the future, laboratory analyses can be substituted, for this soil class.

Palavras-chave : soil mapping; diffuse reflectance; Typic Hapludox.

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