Fern-D

The 10% for arid salt/base accumulation is too low and has no source: drylands occupy about 41% of land, and the cited Ulrich/Bolan texts do not give any share.

55% for the acidifying branch is unsupported as a share of soils: acid soils (pH below 5.5) cover roughly 30% of ice-free land, while drylands (about 40% of land) are alkaline or calcareous, so 55/35/10 overstates humid acidifica…

10% for denitrification in the nitrate fate fork is implausibly low next to 30% leaching: global terrestrial denitrification (roughly 100+ Tg N/yr) exceeds riverine N export (about 45 Tg N/yr), so denitrification is usually as la…

Label says oxidation forms Fe and Al oxides, but aluminium is not redox active (it has only the Al3+ state): Al oxides such as gibbsite form by hydrolysis and desilication, not oxidation. Cited Schwertmann & Taylor is about Fe ox…

The label gives 0.1-0.3 Gt C/yr, but the step's own evidence says 0.1-0.2, and Gaillardet's silicate figure is about 0.1 Gt C/yr, so the upper bound is about double the source. A change request proposes the corrected range.