Simulation of the soil stabilization after tillage, the formation of surface sealing and the change of van Genuchten's alpha, processes that depend on the rain amount, are proposed by Jabro and Jarvis (2003).

where αt is van Genuchten's alpha value after tillage, αt-1 is van Genuchten's alpha value before tillage event, αtilled is van Genuchten's alpha minimum value and I is tillage intensity factor.

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