Publications des scientifiques de l'IRD

Lalitha M., Dharumarajan S., Gomez Cécile, Hegde R., Koyal A., Khandal S., Shashikumar B. N., Parvathy S. (2022). Spectral assessment of soil properties in semi-arid tropical regions of southern Karnataka Plateau. Archives of Agronomy and Soil Science, [Early access], [25 p.]. ISSN 0365-0340.

Titre du document
Spectral assessment of soil properties in semi-arid tropical regions of southern Karnataka Plateau
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000871392500001
Auteurs
Lalitha M., Dharumarajan S., Gomez Cécile, Hegde R., Koyal A., Khandal S., Shashikumar B. N., Parvathy S.
Source
Archives of Agronomy and Soil Science, 2022, [Early access], [25 p.] ISSN 0365-0340
The present study assessed the visible and short wave infrared (VNIR-SWIR) laboratory spectroscopy coupled random forest regression (RF) technique for predicting soil properties in the southern Karnataka Plateau, India. The spectral data acquired for about 228 profile samples were used to predict key soil properties. The RF model fits well for the spectral prediction of clay (R-2 = 0.65), sand (R-2 = 0.60), cation exchange capacity (R-2 = 0.74), field capacity (R-2 = 0.65) and permanent wilting point (R-2 = 0.72). Wherein soil organic carbon was poorly predicted with an R-2 of 0.22 and RPD of 1.2 due to its lower content and narrow range (0.8 to 20 g kg(-1)). The spectral assessment by PCA showed that the first (50%) and third (34%) components had high spectral variation and significantly correlated with soil properties such as pH, CEC, clay, FC, and PWP related to wavelengths indicating clay minerals and iron oxides. However, the second component had less spectral variation (13%) that is related to wavelengths indicating various organic components and correlated well with SOC. Thus, the VNIR-SWIR spectroscopy could be a suitable supplementary method for rapidly predicting soil properties related to clay minerals and iron oxides.
Plan de classement
Pédologie [068] ; Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
INDE ; ZONE TROPICALE ; ZONE SEMIARIDE
Localisation
Fonds IRD [F B010086379]
Identifiant IRD
fdi:010086379
Contact