Fraction | Yield (g kg−1soil) | Asha(g kg−1humic fraction) | Elemental compositionb(g kg−1humic fraction) | Molar ratio | ||||
---|---|---|---|---|---|---|---|---|
 |  |  | C | H | N | O | O/C | |
pH 1 | Insoluble | 83.9 | 247 | 541a | 42a | 43a | 374a | 0.5 |
Soluble | 2.3 | 196 | 478bd | 44a | 43a | 434bc | 0.7 | |
pH 3 | Insoluble | 88.0 | 267 | 525a | 45a | 42a | 388ab | 0.5 |
Soluble | 7.2 | 127 | 493bc | 41a | 45a | 421abc | 0.6 | |
pH 5 | Insoluble | 22.2 | 542 | 478bd | 55b | 40a | 427bc | 0.7 |
Soluble | 60.3 | 225 | 518ac | 49b | 41a | 392ab | 0.6 | |
pH 7 | Insoluble | 7.4 | 609 | 451d | 52b | 39a | 459c | 0.8 |
Soluble | 67.3 | 283 | 534a | 49b | 42a | 375a | 0.5 |