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RESEARCH ARTICLE
Contents Vol 45(8)

Variation in soil strength, bulk density and gravel concentration along a toposequence in Abeokuta, south-western Nigeria

F. K. Salako A C , P. O. Dada B , J. K. Adesodun A , F. A. Olowokere A and I. O. Adekunle A
+ Author Affiliations
- Author Affiliations

A Department of Soil Science and Land Management, University of Agriculture, PMB 2240, Abeokuta, Nigeria.

B Department of Agricultural Engineering, University of Agriculture, PMB 2240, Abeokuta, Nigeria.

C Corresponding author. Email: kfsalako@yahoo.ie or fsalako@ictp.it

Australian Journal of Soil Research 45(8) 643-650 https://doi.org/10.1071/SR07057
Submitted: 15 May 2007  Accepted: 18 October 2007   Published: 7 December 2007

Abstract

This study was carried out at Abeokuta, south-western Nigeria, to understand the variation in soil strength, gravel distribution, and bulk density along a toposequence. In 2003, a 120-m transect on a fallowed land was sampled at every 1 m for topsoil bulk density measurement by excavation (3278 cm3 pits), while soil strength was measured at every soil depth increment of 25 mm to 0.50 m depth. Total dry (ρt) and fine earth (<2 mm) (ρf) bulk densities were determined. Soil water content was also determined. Gravel was divided into classes of 2–4, 4–8, 8–16, and >16 mm. In 2006, four 100-m transects were considered; two each on adjacent fallowed and cultivated lands. Soil strength and water content were measured. The fine earth fraction of topsoil ranged from 62 to 90.6%. Gravel in the 2–4 mm class was dominant with a range of 0.8–35.7%. Thus, cores ≥50 mm could be used in the topsoil to obtain reliable estimates of bulk density.

Total bulk density (ρt) was reduced by 4–19% when corrected for gravel to obtain ρf. Soil strength of the lower slope was highest in 2003 (1981–4482 kPa) and lowest in 2006 (1546 kPa). In spite of the apparent significant influence of water content on soil strength, the relationship was weakly expressed by regression analysis, as only 35% of variation in soil strength was explained by water content at 0.10–0.15 m soil depth in 2003. No relationship was found in 2006; the cultivated segment had higher soil strength (2045 kPa) than the fallowed segment (1970 kPa) even though the water contents were similar. Also, only the 2–4 mm gravel significantly influenced ρt. Land use, soil depth, and slope position significantly affected soil strength. Root-limiting soil strength (>2000 kPa) would certainly be encountered below 0.20 m soil depth in the wet season irrespective of land use. Management of this gravelly landscape must be based on the heterogeneous nature of soil physical properties along the toposequence, and this could be made effective by grouping the soils according to slope position and taking interest in the few portions of the landscape with extreme values of gravel distribution and high soil strength.

Additional keywords: penetrometer resistance, rock fragments, fallow, cultivation, compaction.


Acknowledgments

The authors wish to thank Iro A., Oumarou A., Monday Joseph, Bello Ayoade, Bisi Sonuga, and Temitope. A. Adewole, formerly of the Department of Soil Science and Land Management, University of Agriculture, Abeokuta, for their technical and field support. The paper was written when the first author was on sabbatical leave in the Department of Environmental Sciences, University Ca’Foscari of Venice (UNIVE), Venice, Italy, under the Training in Italian Laboratory Programme (TRIL) of the International Centre for Theoretical Physics (ICTP), Trieste, Italy. He expresses his gratitude to Profs. G. M. Zuppi (UNIVE) and G. Furlan (TRIL-ICTP) for their encouragement and support.


References


Agridry Rimik Pty Ltd. (1994) ‘Rimik CP cone penetrometer.’ (Agridry Rimik Pty. Ltd: Toowoomba, Qld)

Ahn PM (1970) ‘West African soils.’ (Oxford University Press: Oxford, UK)

Analytical Software (1998) ‘STATISTIX for Windows. Version 2.’ (Analytical Software: Tallahassee, FL)

Blake GR , Hartge KH (1986) Bulk density. In ‘Methods of soil analysis. Part 1. Physical and mineralogical methods’. (Ed. A Klute) pp. 363–375. (ASA-SSSA: Madison, WI)

Brye KR, Morris TL, Miller DM, Formica SJ, Van Eps MA (2004) Estimating bulk density in vertically exposed stoney alluvium using a modified excavation method. Journal of Environmental Quality 33, 1937–1942.
| PubMed |
open url image1

Buchter B, Aina PO, Azari AS, Nielsen DR (1991) Soil spatial variability along transects. Soil Technology 4, 297–314.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Cotching WE, Belbin KC (2007) Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrasols in north-west Tasmania. Australian Journal of Soil Research 45, 147–152.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Fasina AS, Omolayo FO, Falodun AA, Ajayi OS (2007) Granitic derived soils in humid forest of southwesthern Nigeria – Genesis, classification and sustainable management. American-Eurasian Journal of Agricultural and Environmental Sciences 2, 189–195. open url image1

Franzen H, Lal R, Ehlers W (1994) Tillage and mulching effects on physical properties of a tropical Alfisol. Soil and Tillage Research 28, 329–346.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Ghuman BS, Lal R (1992) Effects of soil wetness at the time of land clearing on physical properties and crop response on an Ultisol in southern Nigeria. Soil and Tillage Research 22, 1–11.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Harrison RB, Adams AB, Licata C, Flaming B, Wagoner GL, Carpenter P, Vance ED (2003) Quantifying deep-soil and coarse-soil fractions: avoiding sampling bias. Soil Science Society of America Journal 67, 1602–1606. open url image1

Hillel D (1998) ‘Environmental soil physics.’ (Academic Press: San Diego, CA)

Hulugalle NR, Ezumah HC (1991) Effects of cassava-based cropping systems on physico-chemical properties of soil and earthworm casts in a tropical Alfisol. Agriculture, Ecosystems & Environment 35, 55–63.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Jury W , Horton R (2004) ‘Soil physics.’ 6th edn (John Wiley & Sons Inc.: New Jersey)

Lal R (1987) ‘Tropical ecology and physical edaphology.’ (John Wiley: Chichester, UK)

Lal R (1996) Deforestation and land-use effects on soil degradation and rehabilitation in western Nigeria. I. Soil physical and hydrological properties. Land Degradation and Development 7, 19–45.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Lal R (1997) Long-term tillage and maize monoculture effects on a tropical Alfisol in western Nigeria. 1. Crop yield and soil physical properties. Soil and Tillage Research 42, 145–160.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Lal R , Shukla MK (2004) ‘Principles of soil physics.’ (Marcel Dekker, Inc.: New York)

Landon JR (1991) ‘Booker tropical soil manual: a handbook for soil survey and agricultural land evaluation in the tropics and subtropics.’ Paperback edn (Booker Tate Limited/Longman Scientific & Technical: London)

Ley GJ, Mullins CE, Lal R (1989) Hard-setting behaviour of some structurally weak tropical soils. Soil and Tillage Research 13, 365–381.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Meredieu C, Arrouays D, Goulard M, Auclair D (1996) Short range soil variability and its effects on red oak growth (Quercus rubra L.). Soil Science 161, 29–38.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Moormann FR , Lal R , Juo ASR (1975) ‘The soils of IITA.’ (International Institute of Tropical Agriculture: Ibadan, Nigeria)

Nyssen J, Haile M, Poesen J, Deckers J, Moeyersons J (2001) Removal of rock fragments and its effects on soil loss and crop yield, Tigray, Ethiopia. Soil Use and Management 17, 179–187.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Ogban PI, Babalola O (2003) Soil characteristics and constraints to crop production in inland valley bottoms in southwestern Nigeria. Agricultural Water Management 61, 13–28.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Oyedele DJ, Aina PO (1998) A study of soil factors in relation to erosion and yield of maize on a Nigerian soil. Soil and Tillage Research 48, 115–125.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Poesen J, Lavee H (1994) Rock fragments in topsoils: significance and processes. CATENA 23, 1–28.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Robertson GP, Crum JR, Ellis B (1993) The spatial variability of soil resources following long-term disturbance. Oecologia 96, 451–456.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Rodrigue JA, Burger JA (2004) Forest soil productivity of mined land in the Midwestern and Eastern coal field regions. Soil Science Society of America Journal 68, 833–844. open url image1

Salako FK, Dada PO, Adejuyigbe CO, Adedire MO, Martins O, Akwuebu CA, Williams OE (2007) Soil strength and maize yield after topsoil removal and application of nutrient amendments on a gravelly Alfisol toposequence. Soil and Tillage Research 94, 21–35.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Salako FK, Kirchhof G, Tian G (2006b) Management of a previously eroded Alfisol with herbaceous legumes: soil loss and properties under mound tillage. Soil and Tillage Research 89, 185–195.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Salako FK, Tian G, Kang BT (2002) Indices of root and canopy growth of leguminous cover crops in the savanna zone of Nigeria. Tropical Grasslands 36, 33–46. open url image1

Salako FK, Tian G, Kirchhof G, Akinbola GE (2006a) Soil particles in agricultural landscapes of a derived savanna in southwestern Nigeria and implications for selected soil properties. Geoderma 137, 90–99.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Sands R, Greacen EL, Gerard CJ (1979) Compaction of sand soils in radiata pine forests. I. A penetrometer study. Australian Journal of Soil Research 17, 101–113.
| Crossref | GoogleScholarGoogle Scholar | open url image1

SAS Institute (1999) ‘SAS System for Windows. Version 8.’ (SAS Institute: Cary, NC)

Sauer TJ, Logsdon SD (2002) Hydraulic and physical properties of stony soils in a small watershed. Soil Science Society of America Journal 66, 1947–1956. open url image1

Schaetzl RJ , Anderson S (2005) ‘Soils: Genesis and geomorphology.’ (Cambridge University Press: Cambridge, UK)

Soil Survey Staff (1993) ‘Soil survey manual. Soil Conservation Service.’ US Department of Agriculture Handbook 18. (USDA: Washington, DC)

Soil Survey Staff/Natural Resource Conservation Service (2001) ‘National soil survey handbook title 430.VI.’ (USDA/NRSC: Washington, DC)

Sojka RE, Buscher WJ, Lehrsch GA (2001) In situ strength, bulk density and water content relationships of a Durinodic Xeric Haplocalcid soil. Soil Science 166, 520–529.
| Crossref | GoogleScholarGoogle Scholar | open url image1