Spatial Variation of some Soil Physico-Chemical Properties of an Alfisol in Southwestern Nigeria

Tabi, Fritz Oben; Ogunkunle, A. O.

doi:10.4314/njser.v7i1.28421

Cited by 17 publications

(22 citation statements)

References 0 publications

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“…The topsoils and subsoils showed comparable pH values, implying that 30 cm is perhaps too small a depth interval for studying changes in soil reaction in this environment. Of all the soil properties of the present study, the soil pH varied the least, an observation supporting similar studies (Adhikari et al, 2012;Ogunkunle, 1993;Tabi and Ogunkunle, 2007;Oku et al, 2010). The effect of land use on the SOM concentration was more pronounced than those of location and depth zone.…”

Section: Resultssupporting

confidence: 92%

“…This meant that, although most of the values were observed at the lower end of the range, the data spanned a broad range. A good example here is the SOM concentration in the subsoil (30-60 cm), as also found by Tabi and Ogunkunle (2007) in another derived-savanna environment.…”

Section: T a B L E 3 Spatial Variability In Selected Structural Propmentioning

confidence: 94%

“…Interest in the subject has, however, been awakened among tropical researchers, especially those in West Africa. In Nigeria, for instance, after the pioneer works of Folorunso et al (1988) and Ogunkunle (1993) in northern and southern regions, respectively, many other studies sought to understand soil spatial variability (Abu and Malgwi, 2011;Oku et al, 2010;Tabi and Ogunkunle, 2007;Wuddivira et al, 2000). For the acid Ultisols that abound in the tropics, variability is due mostly to inherent factors of soil genesis and inherited factors of land use (Dobermann et al, 1995).…”

Section: Introductionmentioning

confidence: 97%

“…Idowu et al (2003) and Tabi and Ogunkunle (2007) used this approach to arrive at the minimum number of soil samples per hectare for predicting mean properties of Alfisols in southwestern Nigeria. Int.…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of uncultivated soils in derived savanna

Obalum¹,

Oppong²,

Igwe³

et al. 2013

International Agrophysics

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The spatial variability of some physicochemical properties of topsoils/subsoils under secondary forest, grassland fallow, and bare-soil fallow of three locations was evaluated. The data were analyzed and described using classical statistical parameters. Based on the coefficient of variation, bulk density, total porosity, 60-cm-tension moisture content, and soil pH were of low variability. Coarse and fine sand were of moderate variability. Highly variable soil properties included silt, clay, macroporosity, saturated hydraulic conductivity, organic matter concentration, and cation exchange capacity. Overall, soil pH and silt varied the least and the most, respectively. Relative weighting showed that location dominantly influenced the soil variability, except for soil porosity and organic matter concentration influenced mostly by land use. Most of the soil data were normally distributed; others were positively skewed and/or kurtotic. The minimum number of samples (at 25 samples ha-1) required to estimate mean values of soil properties was highly soil property-specific, ranging from 1 (topsoil pH-H2O) to 246 (topsoil silt). Cation exchange capacity of subsoils related fairly strongly with cation exchange capacity of topsoils (R2 = 0.63). Spatial variability data can be used to extrapolate dynamic soil properties across a derived-savanna landscape.

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Section: Resultssupporting

confidence: 92%

Section: T a B L E 3 Spatial Variability In Selected Structural Propmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spatial variability of uncultivated soils in derived savanna

Obalum¹,

Oppong²,

Igwe³

et al. 2013

International Agrophysics

View full text Add to dashboard Cite

show abstract

“…The range indicates the distance in a field where measured properties are no longer spatially correlated. Measured properties of the samples at a distance less than the range become more alike with decreasing distances between them (Tabi and Ogunkunle, 2007). The similar range for BD and Ks may be related to the interaction between soil structure and water flow.…”

Section: Discussionmentioning

confidence: 82%