Assessment of sugarcane harvesting residue effects on soil spectral behavior

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Data

2016-03-01

Autores

Dematte, Jose A. M.
Terra, Fabricio da Silva
Otto, Rafael
Toma, Raul Shiso
Pereira, Luiz Henrique [UNESP]
Nascimento, Alexandre Ferreira do
Melo Bortoletto, Marco Antonio

Título da Revista

ISSN da Revista

Título de Volume

Editor

Univ Sao Paolo

Resumo

When the harvesting of sugarcane involves a mechanized process, plant residues remain on the soil surface, which makes proximal and remote sensing difficult to monitor. This study aimed to evaluate, under laboratory conditions, differences in the soil spectral behavior of surface layers Quartzipsamment and Hapludox soil classes due to increasing levels of sugarcane's dry (DL) and green (GL) leaf cover on the soil. Soil cover was quantified by supervised classification of the digital images (photography) taken of the treatments. The spectral reflectance of the samples was obtained using the FieldSpec Pro (350 to 2500 nm). TM-Landsat bands were simulated and the Normalized Difference Vegetation Index (NDVI) and soil line were also determined. Soil cover ranged from 0 to 89 % for DL and 0 to 80 % for GL. Dry leaf covering affected the features of the following soil constituents: iron oxides (480, 530 and 900 nm) and kaolinite (2200 nm). Water absorption (1400 and 1900 nm) and chlorophyll (670 nm) were determinant in differentiating between bare soil and GL covering. Bands 3 and 4 and NDVI showed pronounced variations as regards differences in soil cover percentage for both DL and GL. The soil line allowed for discrimination of the bare soil from the covered soil (DL and GL). High resolution sensors from about 50 % of the DL or GL covering are expected to reveal differences in soil spectral behavior. Above this coverage percentage, soil assessment by remote sensing is impaired.

Descrição

Palavras-chave

TM-Landsat, NDVI, soil remote sensing, soil proximal sensing, soil line

Como citar

Scientia Agricola. Cerquera Cesar: Univ Sao Paolo, v. 73, n. 2, p. 159-168, 2016.