SOIL WATER CHARACTERISTICS OF TWO AGRO-ECOLOGICAL ZONES OF KATSINA STATE, NIGERIA: A COMPARISON STUDY BETWEEN THE SOILWAT MODEL AND LABORATORY TEST
Abstract
Soil water characteristics (SWC) is essential for studying water availability for plants, plant water stress, infiltration, water conductivity, drainage and irrigation scheduling. However, field determination of available soil water is often laborious and time consuming. In lieu of this, SOILWAT model can be used. The experiment covers two agro-ecological zones of Katsina State to compare results of SOILWAT model prediction of soil water characteristics and measured results of different soil depth of Katsina State. 84 soil samples were collected at depths 0 to 30 and 30 to 60 cm for top and subsoil respectively at 7 locations in the zones and reference points also recorded. The measured and predicted values of the SWC were compared using, mean bias of error, range and kriged form of interpolation map using GIS Software. The results of the predicted soil textural classes obtained from the SOILWAT model were similar to the measured textural classes for Sudan Savanna (SS) and Northern Guinea Savanna (NGS), however, the SS soils have more sand components than NGS
References
Aliku, O. and Oshunsamya, O. S. (2016). Establishing relationship between measured and predicted 1 soil water characteristics using SOILWAT model in three agro-ecological zones of Nigeria Department of Agronomy, University of Ibadan, Nigeria. Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-165, 2016 Manuscript under review for journal Geosci. Model Dev. Published: 15 August 2016
Brooks, R. H., and Corey, A. T., (1964). Hydraulic Properties Of Porous Media. Hydrology Paper No. 3, Colorado State U., Fort Collins, Colorado.
FAO (2006). Guidelines for Soil Description (4th edition). FAO, Rome.
Fredlund, D. G., and Rahardjo, H. (1993). Soil Mechanics for Unsaturated Soils. John Wiley &Sons, New York, N. Y.
Fredlund, D.G. and Xing A. (1994) Equations for the soil-water characteristic curve. Canadian Geotechnical Journal 31, 521-532.
Gee, G.W. and Or, D. (2002). Particle Size Analysis. Methods of Soil Analysis. Part 4, 255-293.
Kern, J.S. (1995). Evaluation of soil water retention models based on basic soil physical properties. Soil Sci. Soc. Am. J., 5 Vanapalli, S. K., Fredlund, D.G. and Pufahl, D. E. (1999). The Influence of Soil Structure and Stress History on the Soil-Water Characteristics of a Compacted Till. Geotechnique Vol. 48, No. 2, pp. 143 – 159
Mualem, Y. (1986). Hydrraulic conductivity of unsaturated soils: prediction and formulas. In Methods of soils analysis. Part1. Physical and mineralogical methods 2nd 3dn, Agronomy (ed. A. klute), pp, 799-823, Madison, Wis: American Society of Agronomy.
Nelson, D. W. and Sommers, L. E. (1982). Total carbon, organic carbon and organic matter. In: Page et al (eds) Methods of Soil Analysis. Part2. 2nd ed. Agron. monog. 9. ASA and SSSA, Madison, WI. Pp. 539-579.
Oyeogbe, A. I. and Oluwasemire, K. O. (2013). Evaluation of SOILWAT Model for Predicting Soil Water Characteristics in Southwestern Nigeria. International Journal of Soil Science, 8: 58-67.Bouma, J., 1989. Using soil survey data for quantitative land evaluation. Adv. Soil Sci., 9: 177-213.
Pleysier, J. L. (1995). Soil sampling and sample preparation. IITA research guide, No 2. Ibadan, Nigeria: IITA (p. 27)
Saxton, K. E. and Rawls, W. J. (2006). Soil water characteristic estimates by texture and organic matter for hydrologic solutions. Soil Sci. Soc. Am. J. 70:1569 – 1578.
Saxton, K. E. and Willey P. H. (2006). The SPAW Model for Agricultural Field and Pond Hydrologic Simulation. Chapter 17 in: Mathematical Modeling of Watershed Hydrology, V. P. singh abd D. frevert, (Ed.); CRC Press LLC.Sigua, C. G and Hudnall, W. H.(2008). Kriging analysis of soil properties. Journal of Soils and Sediments. 8.10.1007/s11368-008-0003-7
van Genuchten, M.Th. (1980). A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J.44:892–898.
Vanapalli, S. K., Fredlund, D.G. and Pufahl, D. E. (1999). The Influence of Soil Structure and Stress History on the Soil-Water Characteristics of a Compacted Till. Geotechnique Vol. 48,No. 2, pp. 143 – 159
Walczak, T. R., Witkowska-Walczak, B. and Slawinski, C. (2002). Comparison of correlation models for the estimation of the water retention characteristics of soil. Int. Agrophys., 16: 79-82.9: 1134-1141.
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