Predictive Performance of Mobile Vis-NIR Spectroscopy for Mapping Key Fertility Attributes in Tropical Soils through Local Models Using PLS and ANN

Autor(es)

Eitelwein, Mateus Tonini ; Tavares, Tiago Rodrigues ; Molin, Jose Paulo ; Trevisan, Rodrigo Goncalves ; de Sousa, Rafael Vieira ; Dematte, Jose Alexandre Melo

• Tipo de documento: Artigo Científico
• Fonte: AUTOMATION; v. 3, n. 1, p. 16-pg., 2022-03-01.

Resumo

Mapping soil fertility attributes at fine spatial resolution is crucial for site-specific management in precision agriculture. This paper evaluated the performance of mobile measurements using visible and near-infrared spectroscopy (vis-NIR) to predict and map key fertility attributes in tropical soils through local data modeling with partial least squares regression (PLS) and artificial neural network (ANN). Models were calibrated and tested in a calibration area (18-ha) with high spatial variability of soil attributes and then extrapolated in the entire field (138-ha). The models calibrated with ANN obtained superior performance for all attributes. Although ANN models obtained satisfactory predictions in the calibration area (ratio of performance to interquartile range (RPIQ) >= 1.7) for clay, organic matter (OM), cation exchange capacity (CEC), base saturation (V), and exchangeable (ex-) Ca, it was not repeated for some of them when extrapolated into the entire field. In conclusion, robust mappings (RPIQ = 2.49) were obtained for clay and OM, indicating that these attributes can be successfully mapped on tropical soils using mobile vis-NIR spectroscopy and local calibrations using ANN. This study highlights the need to implement an independent test to assess reliability and extrapolability of previously calibrated models, even when extrapolating the models to neighboring areas. (AU)

• Processo FAPESP: 14/10737-3 - Avaliação da espectroscopia de reflectância (Vis-NIR) e sensores eletroquímicos em campo para a quantificação de atributos químicos e físicos do solo
• Beneficiário: Mateus Tonini Eitelwein
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 20/16670-9 - Modelagem de dados espectrais para análise da fertilidade de solos tropicais: associação das técnicas vis-NIR e XRF para a modernização dos métodos tradicionais de análise
• Beneficiário: Tiago Rodrigues Tavares
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado