Table 2 Pearson correlation coefficients between SOM and its fractions and soybean machine-harvested (MH) and hand-harvested (HH) grain yield, root biomass yield and total soybean plant yield (n = 56).

SOM and fractions	MH grain yield	HH grain yield	Root biomass	Total soybean biomass
SOC stock	0.43**	0.41**	0.13	0.42**
TN stock	0.54***	0.49***	0.21	0.50***
fPOM-C stock	− 0.10	− 0.08	− 0.15	− 0.09
oPOM-C stock	0.72***	0.56***	0.31*	0.56***
MAOM-C stock	0.34**	0.34**	0.10	0.36**
fPOM-N stock	0.29*	0.28*	0.22	0.31*
oPOM-N stock	0.74***	0.53***	0.25	0.52***
MAOM-N stock	0.46***	0.45***	0.18	0.46***
fPOM-C (% SOC)	− 0.21	− 0.20	− 0.20	− 0.22
oPOM-C (% SOC)	0.67***	0.53***	0.35**	0.53***
MAOM-C (% SOC)	− 0.37**	− 0.26*	− 0.11	− 0.25*
fPOM-N (% TN)	0.06	0.06	0.09	0.08
oPOM-N (% TN)	0.61***	0.43**	0.24	0.41**
MAOM-N (% TN)	− 0.61***	− 0.40**	− 0.25	− 0.40**
SOC:TN ratio	− 0.53***	− 0.48***	− 0.34*	− 0.47**
fPOM-C:fPOM-N ratio	− 0.33*	− 0.32*	− 0.36*	− 0.36*
oPOM-C:oPOM-N ratio	0.32*	0.29**	0.23	0.40**
MAOM-C:MAOM-N ratio	− 0.16	− 0.18	− 0.30*	− 0.18

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