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Ajayi
AS
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Original Research Article Performance of Soilwat Model for Soil Physical Properties Simulation in Auchi, Edo State |
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*1Ajayi A. S., 1Eriakha E. C., 2Abu Malik and 1Ibrahim Rasheed |
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1Department
of Agricultural and Bio-Environmental Engineering Technology,
Auchi Polytechnic Auchi, Edo State Nigeria |
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Abstract |
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The physical properties of soils are dominant factors affecting
the use of a soil which determine the availability of O2
in soils, the mobility of water into and through soils and case
of root penetration and also the chemical and biological
behavior of soil. The aim of this paper was to investigate the
performance of soil physical properties data that was OILWAT
model in the prediction of soil physical properties adapted from
previous study in the Department of Agricultural and
Bio-Environmental Engineering Technology. SOILWAT performed
poorly in simulating volumetric moisture content, the equation
of the line obtained is y = 0.0403x + 15.428, with the R˛ =
0.0274, the RMSE value is 4.21 which is quite large compare to
the model’s ability to simulate bulk density and saturated
hydraulic conductivity. When compared with the measured data,
SOILWAT significantly simulated Bulk Density (BD) for Sandy loam
and sandy clay loam soil having a perfect agreement between the
observed and simulated values (R2 = 0.90, p<0.05;
RMSE of 0.033 and regression equation given as; y = x – 0.33).
The model significantly predicted the Saturated hydraulic
conductivity, with R2 value of 0.92 and root mean
square error (RMSE) 0.03, the equation of best fit obtained is y
= x+0.21, since sample environment (confinement and overburden)
are not represented in laboratory procedures, laboratory data
may not always agree with field data. |
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