can usually be neglected and the osmotic component must only
be considered in heavily fertilized or saline soils.
In unsaturated soils, capillary forces create a negative
pressure or "matric suction" which is expressed in pressure
units. (Pascal 10$ Pa = 1 bar. Soil suction ranges from
nearly 0 Painfully saturated soils to 10? Pain completely
dry soils.
2.8.113 Relationship between soil moisture potential and moisture
content.
It is possible to convert matric soil potential to moisture
oontent, but there is no general relationship for all soils.
Furthermore, there is no unique function for any given soil,
because due to hysteresis, the relation between soil water
suction and soil water content is not single valued.
Approximate conversion coefficients for individual soils are
therefore generally obtained by field experiments, although
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