Table 2.

Landscape means, averaged across the control and two humic product treatments, for concentrations of phenol and carbohydrate compounds in maize roots for the 2014 growing season, for the upland (Up) and lowland (Low) transects, and the significance (P) of the landscape effect.

Compound	Up	Low	P
Phenols (mg phenol 100 mg-1 plant organic C)
Syringaldehyde	2.372	2.221	0.058
Acetosyringone	0.660	0.616	0.052
Syringic acid	0.494	0.483	0.486
Vanillin	1.098	1.100	0.662
Acetovanillone	0.148	0.146	0.952
Vanillic acid	0.146	0.154	0.038
Ferulic acid	1.126	1.112	0.435
p-Coumaric acid	3.846	3.670	0.141
p-OH-benzaldehyde	0.238	0.228	0.107
p-OH-acetophenone	0.032	0.032	0.887
p-OH-benzoic acid	0.042	0.042	0.940
Total (P11)	10.203	9.834	0.199
Carbohydrates (g kg-1)
Arabinose	17.9	18.9	0.097
Galactose	9.3	10.5	0.086
Xylose	92.6	119.3	0.012
Weak-acid glucose	54.9	41.3	0.164
Strong-acid glucose	159.0	190.3	0.012

Color coding represents phenol families.