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* Must contain a minimum of 5% organic matter by dry weight;
* Must contain a minimum of 5% organic matter by dry weight;
* Must have a pH of between 6.0 and 7.8;
* Must have a pH of between 6.0 and 7.8;
−* Must have a sodium absorption ratio of less than 15;
+* Must have a sodium absorption ratio less than 15;
* Must have a cation exchange capacity of greater than 10 milliequivalents per 100 grams (meq/100 g).
* Must have a cation exchange capacity of greater than 10 milliequivalents per 100 grams (meq/100 g).