The categories that were omitted to avoid perfect multicollinearity were: LFH horizon soils
, very poorly drained soils, and Insch Association (parent material).
The soils with higher clay percentages retained positive scores on PC1, with sandier soils falling directly opposite (mainly A horizon soils
Sulfuric horizon soils
at Maloneys were generally riper, had greater development of structure and displayed more abundant and prominent Fe(III) mineral/jarosite mottling than those at Blanches.
Seven surface horizon soils
and their sand, silt, and clay fractions were characterised for mineralogy, and K release by extracting samples with 1 mM Ca[Cl.sub.2] solution daily for 10 days.