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£¨1£©P0£º Value of the pressure head below which roots start to extract water from the soil.
£¨2£©POpt£º Value of the pressure head below which roots extract water at the maximum possible rate.
£¨3£©P2H£º Value of the limiting pressure head, below which roots cannot longer extract water at the maximum rate (assuming a potential transpiration rate of r2H).
£¨4£©P2L£º As above, but for a potential transpiration rate of r2L.
£¨5£©P3£º Value of the pressure head, below which root water uptake ceases (usually taken at the wilting point).
£¨6£©r2H£º Potential transpiration rate [LT-1] (currently set at 0.5 cm/day).
£¨7£©r2L£º Potential transpiration rate [LT-1] (currently set at 0.1 cm/day).

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[ Last edited by RiverBasin on 2009-9-15 at 21:10 ]
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