Measurement and characterization of soil-water relationships.
1989
Mulla D.J.
Methods for measuring water content and water potential are discussed. A brief description of instrumentation is given along with a discussion of the principles upon which each method is based. Recommendations are made on the types of operating conditions in which each technique can be used, and the advantages and disadvantages of each method. For measuring soil-moisture content the methods discussed include gravimetric, neutron probe and microwave techniques. The measurement of soil-water potential using tensiometers, pressure chamber apparatus, hanging water columns, moisture blocks, and thermocouple psychrometers is discussed. It is shown that the wetting treatment applied prior to determining the moisture release curve can significantly affect the pore size distribution of the soil and the relation between water content and water potential.
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