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Simulation of the wintertime nitrate shift in the soil


, : Simulation of the wintertime nitrate shift in the soil. Plant and Soil 49(2): 381-394

A simple method for the simulation of transport of non-adsorbed ions such as nitrate during winter is described. The physical model assumes that the soil water movement around the moving nitrate peak is always nearly (quasi-) stationary. Only the 1-dimensional convective-dispersive linear differential equation for the ion movement must be solved. Field capacity values of the soils and periodically averaged precipitation data are used to determine pore-water velocity. Diffusion and hydrodynamic dispersion data are taken from the literature. For the numerical solution a programmable table (micro-) computer could be used. Numerical dispersion is considered in a simple way. Simulated nitrate vs. depth distributions compare reasonably well with the measured nitrate profiles.

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