Spatial variability of uncultivated soils in derived savanna

Obalum, Sunday E.; Oppong, Jimmy Clifford; Igwe, C. A.; Watanabe, Yayoi; Obi, M.E.

doi:10.2478/v10247-012-0068-9

Cited by 17 publications

(15 citation statements)

References 21 publications

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“…This variability can be studied using CV in which case, ranking of CV of soil properties are grouped into different classes including least (< 15%), moderately (15 < 35%) and highly (> 35%) variable according to Wilding (1985). Obalum et al (2013) reported variation among soil properties under contrasting vegetation types in three different locations in southeastern Nigeria using CV. The range of the mean values of silt/clay ratio (SCR) of the soils was 0.73-0.91.…”

Section: Physical Properties Of Soilsmentioning

confidence: 99%

Pedogenesis of two lithologically similar soils under vegetation of contrasting features in Ohaji, south-eastern Nigeria

Ahukaemere¹,

Onweremadu²,

Ndukwu³

et al. 2017

Agro-Sci.

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Section: Physical Properties Of Soilsmentioning

confidence: 99%

Pedogenesis of two lithologically similar soils under vegetation of contrasting features in Ohaji, south-eastern Nigeria

Ahukaemere¹,

Onweremadu²,

Ndukwu³

et al. 2017

Agro-Sci.

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“…Cocoa (Theobroma cacao L.) plantations have a problem of within-field yield variability which may originate form spatial variation is soil properties (Eneje et al, 2012;Obalum et al, 2013). Once established, cacao remains in the same field for decades, therefore cocoa fields are dominated with aging trees growing on variable and depleted soils (Snoeck et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Assessing the temporal stability of spatial patterns of soil apparent electrical conductivity using geophysical methods

Caires

Wuddivira

Bekele

2014

International Agrophysics

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A b s t r a c t. Cocoa remains in the same field for decades, resulting in plantations dominated with aging trees growing on variable and depleted soils. We determined the spatio-temporal variability of key soil properties in a (5.81 ha) field from the International Cocoa Genebank, Trinidad using geophysical methods. Multi-year (2008Multi-year ( -2009) measurements of apparent electrical conductivity at 0-0.75 m (shallow) and 0.75-1.5 m (deep) were conducted. Apparent electrical conductivity at deep and shallow gave the strongest linear correlation with clay-silt content (R = 0.67 and R = 0.78, respectively) and soil solution electrical conductivity (R = 0.76 and R = 0.60, respectively). Spearman rank correlation coefficients ranged between 0.89-0.97 and 0.81-0.95 for apparent electrical conductivity at deep and shallow, respectively, signifying a strong linear dependence between measurement days. Thus, in the humid tropics, cocoa fields with thick organic litter layer and relatively dense understory cover, experience minimal fluctuations in transient properties of soil water and temperature at the topsoil resulting in similarly stable apparent electrical conductivity at shallow and deep. Therefore, apparent electrical conductivity at shallow, which covers the depth where cocoa feeder roots concentrate, can be used as a fertility indicator and to develop soil zones for efficient application of inputs and management of cocoa fields.

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“…This applies to points situated at small distance from each other. This should always be kept in mind when conducting studies using TDR gauges (Janik, 2008;Obalum at al., 2013). At the sites on the fallow (A and B) moisture content changes were similar.…”

Section: Resultsmentioning

confidence: 99%

TDR technique for estimating the intensity of effective non rainfall

Janik

Skierucha

Błaś

et al. 2014

International Agrophysics

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A b s t r a c t. The objective of this paper is to present a method for determining diurnal distribution of the intensity of effective non rainfall water flux. It was found that the application of TDR technique for the determination of diurnal dynamics of effective non rainfall water flux requires temperature correction of sensed volumetric moisture contents. Without temperature correction the error of estimated non rainfall water flux can be as much as 26%. In addition, the effect of temperature changes on the soil surface was determined in 0.5, 1, 2, 3, 4, and 5 hours periods. It was found that the intensity of effective non rainfall water flux was determined to the greatest extent by the rate of temperature drop during the period of 3 h preceding the non rainfall water flux determination. The agreement of non rainfall water flux calculated with the method proposed and that obtained by the collector was better for dew than for hoarfrost periods.K e y w o r d s: TDR technique, effective non rainfall water flux, impermeable barrier INTRODUCTIONKnowledge of the physical processes that affect the efficiency of water infiltration into the surface horizon of soil is important in the formulation of input data for mathematical models describing the movement of water (Jacobs et al., 2002;Reinhard and Reinhard, 2005). Knowledge of the run of processes of that type is important, as water is a source of nutrients for animals and plants (Kidron, 2005;Kolev et al., 2012). In such considerations one should take into account the role of dew, hoarfrost, condenzation of water vapour contained in the soil air, and adsorption of water from the atmosphere. In regions with arid climate the effect of those processes on the water balance of the top horizon of soil may be greater than that of atmospheric precipitation (Agam and Berliner, 2006). As an example, the contribution of dew and hoarfrost in the annual water balance of the surface horizon of soil in a semi-desert area situated in Nevada, USA, amounts to 31 mm year -1 (Malek et al., 1999). With regard to the phenomena considered here, the contemporary methods for the determination of the diurnal dynamics of the intensity of water infiltration can be classified in four groups: methods consisting in measurements with the use of dew and hoarfrost collectors, lysimetric methods, models employing empirical mathematical formulae, and phenomenological models. The first group includes eg the Duvdevani dew gauge, the Cloth Plate Method and the Hiltner Dew Balance. The Duvdevani dew gauge is one of the first devices for the measurement of the dew balance (Duvdevani, 1947). The measured volume of dew deposit should be treated as an estimate and it cannot be compared with absolute values. The Cloth Plate Method is also a method in which the measurement is taken manually. The apparatus is equipped with a glass plate with dimensions of 10 x 10 x 0.2 cm, to the centre of which highly absorbing synthetic fabrics are attached, with dimensions of 6 x 6 cm (Kidron, 1998). In their study, Zangvil ...

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Spatial variability of uncultivated soils in derived savanna

Cited by 17 publications

References 21 publications

Pedogenesis of two lithologically similar soils under vegetation of contrasting features in Ohaji, south-eastern Nigeria

Pedogenesis of two lithologically similar soils under vegetation of contrasting features in Ohaji, south-eastern Nigeria

Assessing the temporal stability of spatial patterns of soil apparent electrical conductivity using geophysical methods

TDR technique for estimating the intensity of effective non rainfall

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