Estimation of clay content by magnetic susceptibility in tropical soils using linear and nonlinear models

Autor(es)

Filla, Vinicius Augusto ^[1] ; Coelho, Anderson Prates ^[1] ; Ferroni, Adrien Dorvalino ^{[1, 2]} ; Rabelo de Souza Bahia, Angelica Santos ^[1] ; Marques, Jr., Jose ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Dept Agr Sci, Res Grp CSME Soil Characterizat Specif Management, Jaboticabal, SP - Brazil

^[2] Aparecida S-N, Novo Horizonte, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geoderma; v. 403, DEC 1 2021.
• Citações Web of Science: 0

Resumo

The application of pedotransfer functions for soil attribute estimation has economic and environmental advantages. However, the appropriate choice of models is essential to obtain high accuracy. The aim was of this study was to evaluate the magnetic susceptibility (chi) potential to estimate soil clay content and to compare the estimation accuracy using linear (simple linear regression, SLR) and nonlinear models (power model, PM, and artificial neural networks, ANNs). An area of approximately 870 ha, cultivated with sugarcane in southeastern Brazil, was delimited and georeferenced for the collection of soil samples. Soil samples were collected every 2.5 ha (0.00-0.25 m), resulting in 372 points. A transect was directed in the area, and another 132 soil samples were collected at regular intervals of 30 m in the same layer. The samples were sent to the laboratory, and chi values were obtained for all points. Pedotransfer functions were developed to estimate the soil clay content using the chi values. The models were calibrated with the 372 points collected from the regular mesh of the 870-ha area, using the 132 points of the transect for validation. Regardless of the type of model applied to the pedotransfer functions, chi proved highly accurate for estimating soil clay content. However, the ANNs and PM increased the estimation accuracy, attenuated the error, and increased the estimation precision for soil samples with clay content below 200 g kg(-1). (AU)

• Processo FAPESP: 13/17552-6 - Espectroscopia de reflectância difusa e suscetibilidade magnética na predição e mapeamento dos atributos do solo em diferentes compartimentos da paisagem.
• Beneficiário: Angélica Santos Rabelo de Souza Bahia
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/13978-9 - Óxidos de ferro da fração argila e emissão de CO2 de latossolos sob cultivo de cana-de-açúcar
• Beneficiário: Vinicius Augusto Filla
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica