Abstract
AbstractCalculations of the upper and lower boundaries of a soil moisture control section are illustrated using only the depth, bulk density, and saturated, −1/3, and/or −15 bar water contents, and amount of coarse fragments of the soil horizons. It is recommended that the difference between the −50 to −100 cm and −15 bar water contents be used for determining and defining the soil moisture control section in medium to fine‐textured soils. Both moisture contents are reasonable approximations of physically or biologically significant moisture levels and easily determined in the laboratory. The definition would then correspond to the familiar available water‐holding capacity (AWC) value currently in use.
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