A Comparison of Physical Soil Organic Matter Fractionation Methods for Amended Soils

Table 4

Total C recovery of fractionation method for amended soil.

Treatment	Method
	PL	SD	SMI	SO	ZM	Mean of treatment (n = 15)
BP	60.3 ± 2.2	67.4 ± 5.6	101.8 ± 8.3	75.8 ± 3.7	53.0 ± 1.1	71.7 ± 4.9A
GCf	69.2 ± 0.7	65.1 ± 0.6	70.1 ± 3.3	85.5 ± 1.9	66.3 ± 0.9	71.2 ± 2.1AB
GCh	74.6 ± 1.5	63.9 ± 1.6	64.5 ± 1.5	74.3 ± 10.3	72.2 ± 5.9	69.9 ± 2.4AB
H	54.3 ± 1.3	44.3 ± 5.3	127.3 ± 17.2	63.7 ± 1.2	47.8 ± 1.9	67.5 ± 8.7AB
Pt	70.8 ± 1.2	51.3 ± 0.5	51.4 ± 1.8	77.8 ± 8.1	61.9 ± 6.4	62.6 ± 3.3B
Mean of method (n = 15)	65.8 ± 2.1b	58.41 ± 2.8b	83.01 ± 8.1a	75.4 ± 3.0a	60.24 ± 2.8b

Values are expressed as a percentage of whole, unsieved, soil C (shown in Table 1). Mean ± standard error (n = 3). Lowercase letters in the bold values signify methods that are not significantly different, and uppercase letters signify treatments that are not significantly different according to two-way ANOVA with Tukey’s post hoc testing (). Method  treatment interactions ().