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(a)
(b)
(c)
Plate 19.5 (a) The top 20 cm of this soil over Chalk in Hampshire is mull humus, showing intimate mixing of mineral particles
and organic colloids by soil fauna and microflora. pH is 7.5. (b) Twigs and needle leaves are only partially broken down in this mor
humus in a Scottish pinewood. pH is 3.5. (c) This moder humus shows only partial decomposition of the moorland plant remains.
pH is 5.2.
Photos: Ken Atkinson
 
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