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SWACROP, a transient, one-dimensional, finite-differ ence soil water model and the Versatile Soil Moisture Budget (VB4), a semi-empirical model, were compared using data from six wheat (Triticum aestivum, L) cropping periods in Parana, Brazil. Locally available input parameters were used in SWACROP and field cali brated coefficients were utilized in VB4 to assess their ability to predict soil water regimes and other hydrological variables. Predic tions of soil moisture content and water storage by the two models were comparable and corresponded very well with field measure ments. The largest deviations between predicted and observed soil moisture contents occurred in the top soil compartment (0-0.1 m). The average absolute difference and standard error of estimate be tween predicted and observed soil water storage over the six cropping periods were less than 12.2 mm and 17.2 mm, respectively. SWACROP predicted higher percolation and lower evapotranspiration and runoff than VB4, due to differences in methods of simulating soil water distribution and actual soil evaporation.
De Faria, R.T., Madramootoo, C.A., Boisvert, J. and Prasher, S.O. 1994. COMPARISON OF THE VERSATILE SOIL MOISTURE BUDGET AND SWACROP MODELS FOR A WHEAT CROP IN BRAZIL. Canadian Agricultural Engineering 36(2):57-68.
Canadian Society for Bioengineering