Pedotransfer Functions for Water Retention in the Main Soils From the Brazilian Coastal Plains

Abstract

Pedotransfer functions (PTFs) are equations used to estimate soil characteristics difficult to determine from other easily obtained ones. Water retention in soil is used in several agronomic and environmental applications, but its direct determination is time consuming and onerous, therefore PTFs are alternatives to obtaining this information more quickly and economically. The aims of this study were to generate a database and develop PTFs for water retention at potentials of -33 kPa (field capacity) and -1500 kPa (permanent wilting point) for Yellow Argisol and Yellow Latosol from the Brazilian Coastal Plains region. The Coastal Plains soils are mostly developed from Barreiras formation (pre-weathered sediments) and their main uses are sugarcane, livestock, forestry and fruticulture. The database to generate the PTFs was composed from the selection of information derived from scientific works and soil survey reports of the region. Specific PTFs were generated for each soil class, in their respective A and B horizons and for solum, through multiple regression by stepwise package of R language programming. Due to the small pedological variability (small number of soil classes containing great geographical expression) and mineralogical uniformity, usually observed in this environment, non-stratification of soil classes to create general PTFs presented similar or superior results compared to equations for each soil class. The adjustment of data demonstrated that water retention values at -33 kPa and -1500 kPa potentials can be estimated with adequate accuracy for the main soils of the Brazilian Coastal Plains through PTFs mainly from particle size distribution and secondarily from organic matter data.Index terms: Database; pedofunction; permanent wilting point; field capacity. RESUMOFunções de pedotransferência (FPTs) são equações usadas para estimar atributos de solo de difícil determinação, a partir de outras mais facilmente obtidas. A retenção de água no solo é utilizada em diversas aplicações agronômicas e ambientais, porém sua determinação direta é demorada e onerosa. Com isso, as FPTs são alternativas para obtenção dessas informações de forma mais rápida e econômica. Conduziu-se este trabalho, com os objetivos de gerar um banco de dados e desenvolver FPTs para a retenção de água nos potenciais de -33 kPa (capacidade de campo) e -1500 kPa (ponto de murcha permanente) para Argissolo Amarelo e Latossolo Amarelo, da região dos Tabuleiros Costeiros brasileiros. Os solos dos Tabuleiros Costeiros são, principalmente, provenientes de sedimentos pré-intemperizados da Formação Barreiras e seus principais usos são cana-de-açúcar, pecuária, silvicultura e fruticultura. O banco de dados para geração das FPTs foi composto, a partir da seleção de informações obtidas de trabalhos científicos e de relatórios de levantamentos de solos da região. Foram geradas FPTs específicas para cada classe de solo em seus respectivos horizontes A e B e para o solum, e FPTs gerais, englobando as classes de solos e seus horizontes, po...

Proximal Sensing and Digital Terrain Models Applied to Digital Soil Mapping and Modeling of Brazilian Latosols (Oxisols)

“…The lack of financial support along with the large area of the country and the scarcity of roads are some of the main issues restricting the creation of more detailed soil maps, since they require intensive field work for sampling and classifying soils. In this sense, digital soil mapping and modeling are viewed as an alternative to increase not only soil information [3], but also the accuracy required for detailed soil maps, by the adoption of new tools and techniques to analyze, integrate and visualize soil and environmental datasets [4]. In recent years, extra effort has been put into the creation and use of new covariates that represent soil-forming factors [5,6], which are crucial for achieving adequate accuracy in soil mapping and a properties [17,[31][32][33].…”

Pedotransfer Functions For Estimation Of Soil Moisture Constants From Penetration Resistance Measurements And Some Soil Properties

“…The RMSE and ME values were increased from 0.1 bar to 15 bar for the sandy soils. In the study by Silva et al (2015), the R 2 values were found to be 0.41 to 0.73 for 0.33 bar, and 0.58 to 0.75 for the 15 bar moisture content estimation models.…”

“…The RMSE and ME values were increased from 0.1 bar to 15 bar for the sandy soils. In the study by Silva et al (2015), the R 2 values were found to be 0.41 to 0.73 for 0.33 bar, and 0.58 to 0.75 for the 15 bar moisture content estimation models. In another similar study, the R 2 value obtained was found to be between 0.23 and 0.85 for moisture constants (Mohanty et al 2014), which is like in this study.…”

Curva De Retenção E Disponibilidade Total De Água Em Latossolos Empregando Funções De Pedotransferência

“…Propriedades físico-hídricas do solo, como a curva de retenção, também podem ser estimadas indiretamente por meiode correlações com dados básicos do solo, como a granulometria, densidade e teor de matéria orgânica (ŠIMŮNEKet al, 2012). Esses métodos indiretos são denominados funções de pedotransferência, podendo substituir procedimentos padrões morosos e dispendiosos (BARROS et al, 2013;SILVA et al, 2015).…”