NSI data reported the largest rate of decline in organic matter in topsoils in England and Wales was on peat soils, bog and upland heath, although this conclusion was not supported by the CS data.
Adroddodd data RhBG bod y gyfradd fwyaf o ostyngiad mewn sylwedd organig mewn uwchbriddoedd yn Lloegr a Chymru ar briddoedd mawn, cors a gwaun uwchdir, er na chefnogwyd y casgliad hwn gan ddata ACG.