There are two strategies as simple control of the transpiration (potential transpiration) that a crop component gives to SoilW. These strategies prevent that the water content in the soil layers becomes less than the wilting point or 0.

where AW is the available water content  (m3 m-3), WC is the soil layer water content  (m3 m-3), WP is the wilting point  (m3 m-3) and s is the layer thickness (mm).

If the potential transpiration T (mm) is equal or less than the available soil water content then the actual transpiration (WU) is equal to the potential transpiration:

If the crop transpiration is greater than the available soil water then the actual transpiration is:

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