Fig. 1. Water-soluble carbon content of the hydrophilic (HPL) and hydrophobic (HPB) fractions of eight plant and two animal manure residues before incubation (left bar) and after (right bar) a 10-d incubation with microbial inoculation. *, **, and *** designate significant difference between the fresh and decomposed total C content at the p = 0.05, 0.01, and 0.001 levels using the student's t test. NS indicates that the mean difference is not significant.