Correlation of properties of Brazilian Haplustalfs with magnetic susceptibility measurements

Abstract

Magnetic susceptibility (χ, mass specific) is useful for easy indirect estimation of other soil properties at a low cost. The aim of this study was to assess the use of χ as measured with an analytical balance for predicting properties with a substantial influence on the management of Typic Haplustalfs in southern Brazil. To achieve this 48 topsoil samples were taken at the intersection points in a rectangular grid of 20 m × 20 m cells, with 38 of these used for calibration and 10 for validation in regression analyses. The obtained χ values were slightly higher than, and highly correlated (r = 0.970; P < 0.001) with those measured with a susceptibility meter. Highly significant (P < 0.001) correlations were also found between χ and other soil properties relevant to soil classification and management such as clay content (r = 0.68), cation exchange capacity (r = 0.62), P sorption capacity (r = 0.76) and haematite content (r = 0.82). Results from a principal component analysis of eight properties important for soil classification explained 11% of the variance in the data set. The good predictive ability of χ was consistent with current knowledge on the formation pathways for pedogenic ferrimagnets. In summary, χ, which can be readily measured with an analytical balance, has the potential for quantifying soil attributes and may therefore be used in pedotransfer functions.

Magnetic susceptibility to identify landscape segments on a detailed scale in the region of Jaboticabal, São Paulo, Brazil

“…These two principal components together explained 53 % of the variability of the soil properties in the three segments studied (US, MS, LS). Siqueira et al (2010), when studying the ability of MS to predict some soil properties, found that the first principal component explained 42 % of the variance of the set of soil properties studied, among which MS was the attribute of greatest discriminatory power within the PC1.…”

“…Therefore, the evaluation of the expected performance of agricultural systems must be improved by the application of quantitative indicators, e.g., the magnetic susceptibility of the soil (Siqueira et al, 2010), which allow objective comparisons and the exact identification of boundaries of landscape segments in the field.…”

“…This soil property can be a useful tool to gain further insights on soil knowledge, aside from being fast and cheap, applied in a number of areas, e.g., environmental monitoring, paleoclimatology, limnology, archeology, stratigraphy, and in pedology (Chaparro et al, 2008). Siqueira et al (2010) found significant correlations between MS ADFE and some soil properties in a study on correlations between soil properties and MS ADFE , in the 0.00 to 0.20 m layer of a eutrophic Acrisol with arenitic source material, harvested by hand with sugarcane burning in the pre-harvest period.…”

Ferramentas Matemáticas, Suscetibilidade Magnética E Modelos De Paisagem Aplicados Na Delimitação De Áreas De Manejo Específico

“…Daniels et al (1971) grande quantidade de amostras, o que dificulta sua utilização tanto pela pesquisa quanto pelo setor produtivo (Siqueira et al, 2010b;Espinar et al, 2011;Sanchez et al, 2012;Xu et al, 2012;Erdős et al, 2013;Matias et al, 2013). Assim, para que a utilização conjunta da classificação numérica e dos modelos de paisagem seja viável, são necessárias técnicas alternativas para quantificar os atributos do solo.…”

Classificação numérica e modelo digital de elevação na caracterização espacial de atributos dos solos

“…Pode-se identificar, por meio deste mapeamento, áreas com maior homogeneidade dos atributos dos solos. Segundo Siqueira et al (2010a), a identificação dessas regiões, chamadas áreas de manejo específico, garante a localização de limites mais precisos entre áreas distintas permitindo, assim, que técnicas agronômicas possam ser transferidas com facilidade e economia, para ambientes semelhantes.…”