Influence of termite infestation on the spatial variability of soil properties in the Guinea savanna region of Nigeria

Jude, C.; Ogunkunle, A. O.

doi:10.1016/j.geoderma.2008.11.003

Cited by 33 publications

(29 citation statements)

References 31 publications

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“…These showed that outliers did not dominate the measure of central tendency but the true indication of the particle size distribution and permanent wilting points of the soils of the study sites. Similarity of means and median of several physical, chemical, and biological soil properties had been reported by Obi and Ogunkunle [16], Shulka et al [17], and Cambardella et al [18]. To enhance the pragmatic aspect of the study, no transformation was attempted although Parkin and Robinson [19] had previously reported that many soil properties are log-normally distributed.…”

Section: Resultssupporting

confidence: 60%

“…In each of the sampling areas (the schools), nine (9) replicate samples were collected perpendicular to the direction of the upper slope, sixteen (16) were also collected from the middle slope, while nine (9) were collected again from the bottom slope. A total of 102 samples [(9 × 3) + (16 × 3) + (9 × 3)] were collected from the three toposequences.…”

Section: Soil Sampling and Laboratory Analysismentioning

confidence: 99%

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Modeling of Permanent Wilting from Particle Size Fractions of Coastal Plain Sands Soils in Southeastern Nigeria

2012

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Permanent wilting points in soils have been found to correlate significantly with particle size fractions. This study was conducted to establish functional relationship between soil particle size fractions and permanent wilting point of soils of coastal plain sands in southeastern Nigeria. A total of 102 surface samples were collected from three different dominantly Ultisols toposequences (i.e., 34 samples from each). Permanent wilting point experiment was carried out in pots with the 102 samples in the greenhouse while the particle size analysis was carried out in the laboratory. There was significant correlation among the textural separates, permanent wilting point correlated significantly with clay (r = 0.21, P ≤ 0.05). The general linear model showed significant differences between permanent wilting point of soils found in the upper and lower slope positions. Regression equation established that 54% of the total variation in permanent wilting point could be accounted for by the clay and coarse sand content of the soils. Prediction of permanent wilting point of Ultisols formed on coastal plain sands soils of humid tropical southeastern Nigeria will effectively depend on reliability of determination of clay and coarse sand contents of the soils.

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Section: Resultssupporting

confidence: 60%

Section: Soil Sampling and Laboratory Analysismentioning

confidence: 99%

Modeling of Permanent Wilting from Particle Size Fractions of Coastal Plain Sands Soils in Southeastern Nigeria

2012

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“…It was observed that many of the variables were either skewed or kurtous in the entire sites. Also, it had been previously reported that soil properties normally display skewed or log normal distribution (Parkin and Robinson, 1992, Cambardella et al, 1994, Shukla et al, 2004, Iqbal, et al, 2005and Obi and Ogunkunle, 2009). Yet, it was only in few instances that the mean and median are reasonably different from each other.…”

Section: Resultsmentioning

confidence: 92%

Profile distribution of clay, Ca, Mg and K in some soils of the Savanna region of Nigeria

Obi¹,

Akinbola²,

Ogunkunle³

et al. 2011

Agro-Science

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“…) and to determine minimum number of samples (OBI & OGUNKUNLE, 2009;MONTANARI et al, 2012). However, it does not allow assessing attribute spatial dependence and accuracy boundary identification among different variable classes.…”

Section: Resultsmentioning

confidence: 99%

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

et al. 2014

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ABSTRACT:There is an increasing demand for detailed maps that represent in a simplified way the knowledge of the variability of a particular area or region maps. The objective was to outline precision boundaries among areas with different accuracy variability standards using magnetic susceptibility and geomorphic surfaces. The study was conducted in an area of 110 ha, which identified three compartment landscapes based on the geomorphic surfaces model. To determinate pH, organic matter, phosphorus, potassium and magnesium, the total sand and clay, 514 soil samples were collected at depths of 0-0.20 m and 0.60-0.80 m. The sum of base, cationic exchange capacity and base saturation were calculated and the magnetic susceptibility was evaluated in the laboratory using a system based on a balance of analytical precision method. Geomorphic surfaces identification allowed setting specific management areas (locations with maximum homogeneity of soil attributes). The map of spatial variability of magnetic susceptibility can be used to validate the precise boundaries among geomorphic surfaces identified in the field and infer the variability of clay content and soil base saturation.KEYWORDS: detailed mapping, pedometrics, accuracy boundaries. DELINEAMENTO DE LIMITES DE PRECISÃO ENTRE ÁREAS COM DIFERETES PADRÕES DE VARIABILIDADE UTILIZANDO SUSCETIBILIDADE MAGNÉTICA E SUPERFÍCIES GEOMÓRFICASRESUMO: Existe uma demanda cada vez maior por mapas detalhados que representem de maneira simplificada o conhecimento da variabilidade de determinada área ou região. O objetivo do trabalho foi delinear limites de precisão entre áreas com diferentes padrões de variabilidade utilizando suscetibilidade magnética e superfícies geomórficas. O trabalho foi realizado em uma área de 110 ha, onde se identificaram três compartimentos de paisagem com base no modelo de superfícies geomórficas. Foram coletadas 514 amostras de solo nas profundidades de 0-0,20 m e 0,60-0,80 m, para a determinação de pH, matéria orgânica, fósforo, potássio e magnésio, areia total e argila. A soma de base, capacidade de troca catiônica e saturação por bases foram calculadas. A suscetibilidade magnética foi avaliada em laboratório, utilizando-se de um método baseado em uma balança de precisão analítica. A identificação das superfícies geomórficas permitiu o reconhecimento de áreas específicas de manejo (locais com máxima homogeneidade dos atributos do solo). O mapa de variabilidade espacial da suscetibilidade magnética pode ser utilizado para validar com precisão os limites entre as superfícies geomórficas identificadas no campo e inferir a variabilidade do teor de argila e saturação por base do solo.

show abstract

Influence of termite infestation on the spatial variability of soil properties in the Guinea savanna region of Nigeria

Cited by 33 publications

References 31 publications

Modeling of Permanent Wilting from Particle Size Fractions of Coastal Plain Sands Soils in Southeastern Nigeria

Modeling of Permanent Wilting from Particle Size Fractions of Coastal Plain Sands Soils in Southeastern Nigeria

Profile distribution of clay, Ca, Mg and K in some soils of the Savanna region of Nigeria

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

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