Saturated Paste Extraction Procedures
The saturated paste extraction procedure calls for placing any volume of substrate in a watertight container. The substrate can be at any moisture level. Water is slowly added with stirring until the surface of the subsrtate just begins to glisten with free water. After 15 minutes, more water is added with stirring if necessary to return the substrate surface to a glistening state. After a total of one to two hours contact between the water and the substrate, the soil solution is squeezed from the slurry through cheescloth. This extraction can be used for pH, EC, and specific-nutrient tests.
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