| http://www.w3.org/ns/prov#value | - Place 20 cc (~25 g) of soil in a plastic 3-oz cup.Add 40 mL of pure water, stir, and allow to stand for 4 h.Without stirring the sample, filter the solution through a Whatman No. 41 (11 cm) paper and collect the extract in a funnel tube or other suitable container.
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