G is the gain factor t is the surface tension of soil water Eosm is the osmotic efficiency coefficient Posm is the osmotic potential

Mw is the molecular weight of water (0.018015 kg mol-1); R is the universal gas constant (8.314 J mol-1 K-1); T is the soil temperature (°K)

The following equation can suggested when reconsidering the salinity effects on the surface tension (Hamdy, A. and Choukr-allah, R. 2002):

Cmoi/kg and Ckg/kg are respectively the concentration in mol kg-1 and Kg Kg-1, Msait is the molecular weight of a soluble salt (=0.05844 kg mol-1 for NaCl)

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