Multi-Sensor Approach for Tropical Soil Fertility Analysis: Comparison of Individual and Combined Performance of VNIR, XRF, and LIBS Spectroscopies

Autor(es)

Tavares, Tiago Rodrigues ^[1] ; Molin, Jose Paulo ^[1] ; Nunes, Lidiane Cristina ^[2] ; Wei, Marcelo Chan Fu ^[1] ; Krug, Francisco Jose ^[2] ; de Carvalho, Hudson Wallace Pereira ^[3] ; Mouazen, Abdul Mounem ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biosyst Engn, Luiz de Queiroz Coll Agr ESALQ, Lab Precis Agr LAP, BR-13418900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, Lab Analyt Chem LQA, BR-13416000 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, Lab Nucl Instrumentat LIN, BR-13416000 Piracicaba, SP - Brazil

^[4] Univ Ghent, Fac Biosci Engn, Dept Environm, Precis Soil & Crop Engn Grp Precis SCoRing, Coupure Links 653, Blok B, 1st Floor, B-9000 Ghent - Belgium

• Tipo de documento: Artigo Científico
• Fonte: AGRONOMY-BASEL; v. 11, n. 6 JUN 2021.
• Citações Web of Science: 0

Resumo

Rapid, cost-effective, and environmentally friendly analysis of key soil fertility attributes requires an ideal combination of sensors. The individual and combined performance of visible and near infrared (VNIR) diffuse reflectance spectroscopy, X-ray fluorescence spectroscopy (XRF), and laser-induced breakdown spectroscopy (LIBS) was assessed for predicting clay, organic matter (OM), cation exchange capacity (CEC), pH, base saturation (V), and extractable (ex-) nutrients in tropical soils. A set of 102 samples, collected from two agricultural fields, with broad ranges of fertility attributes were selected. Two contrasting data fusion approaches have been applied for modeling: (i) merging spectral data of different sensors followed by partial least squares regression (PLS), known as fusion before prediction; and (ii) applying the Granger and Ramanathan (GR) averaging approach, known as fusion after prediction. Results showed VNIR as individual technique to be the best for the prediction of clay and OM content (2.61 <= residual prediction deviation (RPD) <= 3.37), while the chemical attributes CEC, V, ex-P, ex-K, ex-Ca, and ex-Mg were better predicted (1.82 <= RPD <= 4.82) by elemental analysis techniques (i.e., XRF and LIBS). Only pH cannot be predicted regardless the technique. The attributes OM, V, and ex-P were best predicted using single-sensor approaches, while the attributes clay, CEC, pH, ex-K, ex-Ca, and ex-Mg were overall best predicted using multi-sensor approaches. Regarding the performance of the multi-sensor approaches, ex-K, ex-Ca, and ex-Mg, were best predicted (RPD of 4.98, 5.30, and 4.11 for ex-K, ex-Ca and ex-Mg, respectively) using two-sensor fusion approach (VNIR + XRF for ex-K and XRF + LIBS for ex-Ca and ex-Mg), while clay, CEC and pH were best predicted (RPD of 4.02, 2.63, and 1.32 for clay, CEC, and pH, respectively) with the three-sensor fusion approach (VNIR + XRF + LIBS). Therefore, the best combination of sensors for predicting key fertility attributes proved to be attribute-specific, which is a drawback of the data fusion approach. The present work is pioneering in highlighting benefits and limitations of the in tandem application of VNIR, XRF, and LIBS spectroscopies for fertility analysis in tropical soils. (AU)

• Processo FAPESP: 17/21969-0 - Avaliação de técnicas alternativas às análises tradicionais de laboratório para predição de atributos em solos agrícolas: abordagens utilizando espectroscopia VisNIR, XRF e LIBS
• Beneficiário: Tiago Rodrigues Tavares
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 04/15965-2 - Implantação e desenvolvimento de espectrometria de emissão óptica com plasma induzido por laser
• Beneficiário: Francisco José Krug
• Modalidade de apoio: Auxílio à Pesquisa - Temático